BORONIC ACID BEARING LIPHAGANE COMPOUNDS AS INHIBITORS OF P13K- a AND/OR B

ABSTRACT

Compounds with unique liphagane meroterpenoid scaffold having boronic acid functionality in the skeleton are described (formula 1) together with pharmacological potential of these compounds as anticancer agents. A method of preparation and inhibiting the activity of phosphoinositide-3-kinase (PI3K-alpha and beta) has been presented. In particular, the invention describes a method of inhibiting PI3K isoforms, wherein the compounds are novel structures based on liphagane scaffold with unique boronic acid functionality. The methods and uses thereof are described herein this invention.

FIELD OF THE INVENTION

The present invention relates to boronic acid bearing liphagane compounds. The present invention particularly relates to boronic acid bearing meroterpenoid liphagane scaffold based compounds. The compounds have been designed, synthesized and their biological evaluation results for anticancer activity by inhibiting PI3K pathway are presented in this invention. The field of invention for this work relates and covers the development of novel PI3K-α/β inhibitors based on meroterpenoid liphagane scaffold for anticancer activity.

BACKGROUND OF THE INVENTION

PI3Ks are a family of related intracellular signal transducer capable of phosphorylating the 3 position hydroxyl group of the inositol ring of Phosphatidylinositol (PtdIns). They are also known as phosphatidylinositol-3-kinases. The pathway, with oncogene PIK3 and tumor suppressor (PTEN) gene is implicated in insensitivity of cancer tumors to insulin and IGF1, in calorie restriction. 3-kinase (PI3K) signaling pathway is a newly identified strategy for the discovery and development of certain therapeutic agents. Among the various subtypes of PI3K, class IA PI3K-alpha has gained increasing attention as a promising drug target for the treatment of cancer due to its frequent mutations and amplifications in various human cancers. In contrast with cytotoxic agents that do not differentiate between normal proliferating and tumour cells, targeted therapies primarily exert their action in cancer cells. Initiation and maintenance of tumours are due to genetic alterations in specific loci. The identification of the genes in these alterations occurs has opened new opportunities for cancer treatment. The PI3K (phosphoinositide 3-kinase) pathway is often overactive in human cancers and various genetic alteration have been found to cause this. In all cases, PI3K inhibition is considered to be one of the most promising targeted therapies for cancer treatment.

Owing to its widespread activation in inflammation and cancer, a growing appreciation of the therapeutic potential of inhibitors of the phosphoinositide 3-kinase (PI3K) pathway has stimulated intense interest in compounds with suitable pharmacological profiles. These are primarily directed toward PI3K itself. However, as class I PI3Ks are also essential for a range of normal physiological processes, broad spectrum PI3K inhibition could be poorly tolerated.

In recent years, patents describing a new generation of PI3K inhibitors have started to appear, with a particular focus on the development of compounds with enhanced isoform selectivity for use as anti-cancer and anti-inflammatory therapies. However, challenges remain for the efforts to pharmacologically target this enzyme family in a successful manner.

Rationale for the selection of Phosphoinositide 3-kinase-α (PI3K-α/β) inhibitors:—At cellular level, phosphoinositide-3-kinase signaling contributes to many processes, including cell cycle progression, cell growth, survival and migration and intracellular vesicular transport. The PI3K represents the family of lipid kinases that can be classified into three subfamilies according to structure and substrate specificity viz., class I, class II and class III. The class I PI3Ks are the most extensively studied among lipid kinases, are heterodimeric proteins; each containing a smaller regulatory domain and a larger 110 kDa catalytic domain, which occur in four isoforms differentiated as p110α, p110β, p110γ, and p110δ. Although, there are natural product based small molecules reported in the literature which inhibit the PI3-kinases having the IC₅₀ value in nano-gram range (viz., Wortmannin isolated from Penicillium wortmanni, LY294002 a synthetic analogue of the flavonoid quercetin, etc) but these molecules did not reach to market because of low potency, poor isoform or kinase selectivity, limited stability and unacceptable pharmacological and pharmacokinetic properties. However, PI3 kinase inhibitors having isoform selectivity and promising drug-like properties have now begun to emerge that show promise for the treatment of cancer and other disease indications. In cancer, evidence suggests that inhibition of the class 1A PI3 kinases p110α and p110β appear to be the most appropriate to target. Recently, Andersen et al., in 2006 reported the potential isoform selective PI3K-alpha inhibitor from marine sponge Aka coralliphaga under the collaborative program to screen marine invertabrates against human PI3K-alpha keeping in mind that natural products from marine resources have emerged as a copious repository of molecular diversity and hold considerable promise as a rich source of lead structures in drug discovery. Liphagal (Joshua J. Day, Ryan M. McFadden; The catalytic enantioselective total synthesis of (+)-Liphagal; Angew. Chem. Int. Ed. 2011, 50, 6814-6818; Enrique Alvarez-Manzaneda, RachidChahboun; Enantioselectivetotal synthesis of the selective PI3-kinase inhibitor Liphagal; Org. Lett., 2010, 12 (20), pp 4450-4453; Jonathan H. George, Jack E. Baldwin; Enantiospecific biosynthetically inspired formal total synthesis of (+)-Liphagal, Org. Lett., 2010, 12 (10), pp 2394-2397; Alban R. Pereira, Wendy K. Strangman, Synthesis of phosphatidylinositol 3-kinase (PI3K) inhibitory analogues of the sponge meroterpenoid Liphagal; J. Med Chem., 2010, 53 (24), pp 8523-8533; Dima A. Sabbah, Jonathan L. Vennerstrom; Docking studies on isoform-specific inhibition of phosphoinositide-3-kinases; J. Chem. Inf. Model., 2010, 50 (10), pp 1887-1898; Ram Vishwakarma and Sanjay Kumar; Efficient Synthesis of key intermediate toward Liphagal synthesis; Synthetic Communications; 2010, 41(2), pp 177-183; Frederic Marion, David E. Williams, Liphagal, a selective inhibitor of PI3 kinase-α isolated from the sponge Aka coralliphaga: Structure elucidation and biomimetic synthesis; Org. Lett., 2006, 8 (2), pp 321-324; Goverdhan Mehta, Nachiket S. Likhite, C. S. Ananda Kumar A concise synthesis of the bioactive meroterpenoid natural product (±)-liphagal, a potent PI3K inhibitor., Tet. Lett, 2009, vol. 50, no. 37, pp 321-324) was ˜10-fold more potent against PI3K-α than against PI3K-γ. We have synthesized boron containing analog of liphagal by rational modification on this molecule following diversity oriented synthesis approach for the discovery of lead molecules.

OBJECTS OF THE PRESENT INVENTION

The main object of the present invention is to provide boronic acid bearing liphagane compounds. Another object of the invention provides a process for preparation of boronic acid functional group containing liphagane compounds.

Yet another object of the present invention is to provide process for the preparation for step A6 to A7 and A7 to A by the synthetic route mentioned in the claims of this invention document.

Still another object of the present invention is to evaluate biological activity of the boronic acid based liphagal compounds as anticancer agents.

Yet another object of the present invention is to identify isoform selectivity of these compounds for PI3K inhibition as alpha or beta specific when studied for enzyme specificity.

Yet another object of the invention is to explore the mechanism of action and growth inhibition of the liphagal boronic acid bearing compound by Annexin-V or immunofluroscent assay and by cell cycle analysis.

SUMMARY OF THE INVENTION

Accordingly the present invention provides a compound of general formula 1, and pharmaceutically acceptable salts thereof,

wherein,

-   -   a) ‘Y’=O, S, NH or NR, wherein R=alkyl moiety, aryl moiety,         heteroaryl moiety cyclic aliphatic ring or aromatic system;     -   b) wherein n=0 or 1;     -   c) wherein R₁, R₂ and R₃ are independently selected from a group         consisting of H, OH, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NR,         NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″, OCF₃, CF₃ and         R,     -   wherein, R, R′, R″ are independently selected from a group         consisting of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclic aliphatic ring,     -   wherein the cyclic aliphatic ring is selected from a group         consisting of cyclopropyl, cyclobutyl, cyclopentyl and         cyclohexyl ring and wherein the cyclic aliphatic ring has         different substitutions at different positions,     -   wherein the alkyl moiety is selected from a group consisting of         methyl, ethyl, propyl, isopropyl, butyl and isobutyl,     -   and wherein aryl or heteroaryl moiety has substitutions selected         from a group consisting of halo, alkyl with different chain         length, nitro, amino, and sulphonyl substitutions;     -   d) wherein R₄=H or OR or SR or SO₂R or OSO₃R or SiRR′R″ or NH₂         or NHR or NRR′ or an alkyl substituent or one to ten carbon         chain either linear or branched, saturated or unsaturated alkyl         group optionally substituted with OH, H, ═O, ═S, OR, COR, CHO,         CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R′, CN,         SiRR′R″ or R,     -   wherein R, R′, R″ are independently selected from a group         consisting of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclicaliphatic ring with different substitutions with varying         chain length cyclicaliphatic ring with different substitutions         and varying chain length,     -   wherein the alkyl moiety is selected from a group consisting of         methyl, ethyl, propyl, isopropyl, butyl isobutyl,     -   and wherein aryl or heteroaryl moiety has substitutions selected         from a group consisting of halo, alkyl with different chain         length, nitro, amino, and sulphonyl substitutions;     -   wherein the alkyl substituent is selected from a group         consisting of methyl, ethyl, propyl and higher homologues,     -   wherein the higher homologues are linear, branched or alicyclic         substituents,     -   wherein the alicyclic substituents are selected from a group         consisting of cyclopentane, cyclohexane, higher membered rings,         fused rings and aryl/heteroaryl substituted alkyl groups,     -   wherein the aryl/heteroaryl substituted alkyl groups are         benzylic or unsaturated alkyl groups further selected from a         group consisting of cinnamul, crotyl and prenyl substituents;     -   e) wherein R₅, R₆ and R₇ are independently selected from a group         consisting of H, one to ten carbon chain either linear or         branched, saturated or unsaturated at any position, and alkyl         group, wherein the alkyl group is optionally substituted with         OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR′, NRR′, NO₂,         F, Cl, Br, I, OSO₃H, SO₂R, CN, SiR′R′R″ and R,     -   wherein R, R′, R″ independently selected from a group consisting         of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclicaliphatic ring with different substitutions.

In another embodiment of the invention, the compound of general formula 1 is represented by compounds of formula A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, AA, AB, AC, AD, AE, AF, AG, AH, AI, AJ, AK, AL, AM, AN, AO, AP, AQ, AR, AS, AT, AU, AV, AW, AX, AY and AZ comprising the following structural formula:

In another embodiment of the invention, the compound is useful as specific inhibitor of PI3K-α or β isoform in cancer treatment.

Yet another embodiment of the invention provides a process for preparation of compounds of general formula 1 and pharmaceutically acceptable salts thereof

wherein,

-   -   a) ‘Y’=O, S, NH or NR, wherein R=alkyl moiety, aryl moiety,         heteroaryl moiety cyclic aliphatic ring or aromatic system;     -   b) wherein n=0 or 1;     -   ci) wherein R₁, R₂ and R₃ are independently selected from a         group consisting of H, OH, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR,         NR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″, OCF₃, CF₃         and R,     -   wherein, R, R′, R″ are independently selected from a group         consisting of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclic aliphatic ring,     -   wherein the cyclic aliphatic ring is selected from a group         consisting of cyclopropyl, cyclobutyl, cyclopentyl and         cyclohexyl ring and wherein the cyclic aliphatic ring has         different substitutions at different positions,     -   wherein the alkyl moiety is selected from a group consisting of         methyl, ethyl, propyl, isopropyl, butyl and isobutyl,     -   and wherein aryl or heteroaryl moiety has substitutions selected         from a group consisting of halo, alkyl with different chain         length, nitro, amino, and sulphonyl substitutions;     -   di) wherein R₄=H or OR or SR or SO₂R or OSO₃R or SiRR′R″ or NH₂         or NHR or NRR′ or an alkyl substituent or one to ten carbon         chain either linear or branched, saturated or unsaturated alkyl         group optionally substituted with OH, H, ═O, ═S, OR, COR, CHO,         CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R′, CN,         SiRR′R″ or R,     -   wherein R, R′, R″ are independently selected from a group         consisting of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclicaliphatic ring with different substitutions with varying         chain length cyclicaliphatic ring with different substitutions         and varying chain length,     -   wherein the alkyl moiety is selected from a group consisting of         methyl, ethyl, propyl, isopropyl, butyl isobutyl,     -   and wherein aryl or heteroaryl moiety has substitutions selected         from a group consisting of halo, alkyl with different chain         length, nitro, amino, and sulphonyl substitutions;     -   wherein the alkyl substituent is selected from a group         consisting of methyl, ethyl, propyl and higher homologues,     -   wherein the higher homologues are linear, branched or alicyclic         substituents,     -   wherein the alicyclic substituents are selected from a group         consisting of cyclopentane, cyclohexane, higher membered rings,         fused rings and aryl/heteroaryl substituted alkyl groups,     -   wherein the aryl/heteroaryl substituted alkyl groups are         benzylic or unsaturated alkyl groups further selected from a         group consisting of cinnamul, crotyl and prenyl substituents;     -   e) wherein R₅, R₆ and R₇ are independently selected from a group         consisting of H, one to ten carbon chain either linear or         branched, saturated or unsaturated at any position, and alkyl         group, wherein the alkyl group is optionally substituted with         OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR′, NRR′, NO₂,         F, Cl, Br, I, OSO₃H, SO₂R, CN, SiR′R′R″ and R,     -   wherein R, R′, R″ independently selected from a group consisting         of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclicaliphatic ring with different substitutions.         wherein the process comprises the following steps:     -   i) reacting compound 9 with n-butyl lithium or         potassium-tert-butoxide in an ether solvent in presence of a         base;

-   -   ii) adding triethyl or trimethyl borate to the above mixture         obtained in step (i) and stirring;     -   iii) quenching the reaction of step (ii) with saturated ammonium         chloride solution followed by extraction with water immiscible         solvent to obtain compound of general formula 10

-   -   iv) reacting the compound 10 with BI₃ or DMS or AlCl₃/thiourea         in a proportion in the range of 1:1 to 3:4 by moles in an ether         solvent;     -   v) quenching the reaction of step (iv) by addition of hypo         solution followed by extraction with a water immiscible solvent         to obtain compound of general formula 1.

In yet another embodiment of the invention, the ether solvent used in step (i) and (v) is selected from a group consisting of tetrahydrofuran, dichloromethane, diethyl ether, diisopropyl ether and isopropyl ether.

In yet another embodiment of the invention, the base in step (i) is selected from a group consisting of tetramethyl ethylene diamine, triethyl amine, trimethyl amine and diisopropyl ethyl amine.

In yet another embodiment of the invention, reaction in step (i) is carried out at a temperature in the range of −78° C. to 35° C. for a period ranging between 5 to 10 min.

In yet another embodiment of the invention, reaction in step (ii) is carried out at a temperature in the range of 0-5° C., for a period ranging between 1 to 2 h.

In yet another embodiment of the invention, the water immiscible solvent in step (iii) and (v) is selected from a group consisting of ethylacetate, dichloromethane, ether or chloroform.

In still another embodiment of the invention, reaction in step (iv) is carried out at a temperature ranging between −78° C. to 35° C. for a period ranging between 1 to 3 h,

In still another embodiment of the invention, the compound of general formula 1 obtained in step (v) is converted into a pharmaceutically acceptable salt.

In still another embodiment of the invention, the compound of general formula 1 is converted into a pharmaceutically acceptable salt by a process comprising the steps of mixing the compound of general formula 1 with a base in a ratio 1:1 proportion, wherein the base is selected from a group consisting of sodium hydroxide, potassium hydroxide and ammonium hydroxide in water, stirring the reaction mixture for 1-2 h followed by drying to obtain the pharmaceutically acceptable salt of the compound of general formula 1.

Yet another embodiment of the invention provides a pharmaceutical composition comprising an effective amount of the compound of formula 1, optionally along with a pharmaceutically acceptable carrier, salt, excipients or diluents.

In still another embodiment of the invention, the pharmaceutically acceptable carrier is selected from a group consisting of water, buffered saline, glycols, glycerols, olive oil and liposomes.

Still another embodiment of the invention provides a method of treatment of cancer by specific inhibition of PI3K-α or β isoform in a human cancer cell line using a compound of general formula 1,

wherein,

-   -   a) ‘Y’=O, S, NH or NR, wherein R=alkyl moiety, aryl moiety,         heteroaryl moiety cyclic aliphatic ring or aromatic system;     -   b) wherein n=0 or 1;     -   cii) wherein R₁, R₂ and R₃ are independently selected from a         group consisting of H, OH, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR,         NR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″, OCF₃, CF₃         and R,     -   wherein, R, R′, R″ are independently selected from a group         consisting of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclic aliphatic ring,     -   wherein the cyclic aliphatic ring is selected from a group         consisting of cyclopropyl, cyclobutyl, cyclopentyl and         cyclohexyl ring and wherein the cyclic aliphatic ring has         different substitutions at different positions,     -   wherein the alkyl moiety is selected from a group consisting of         methyl, ethyl, propyl, isopropyl, butyl and isobutyl,     -   and wherein aryl or heteroaryl moiety has substitutions selected         from a group consisting of halo, alkyl with different chain         length, nitro, amino, and sulphonyl substitutions;     -   dii) wherein R₄=H or OR or SR or SO₂R or OSO₃R or SiRR′R″ or NH₂         or NHR or NRR′ or an alkyl substituent or one to ten carbon         chain either linear or branched, saturated or unsaturated alkyl         group optionally substituted with OH, H, ═O, ═S, OR, COR, CHO,         CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R′, CN,         SiRR′R″ or R,     -   wherein R, R′, R″ are independently selected from a group         consisting of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclicaliphatic ring with different substitutions with varying         chain length cyclicaliphatic ring with different substitutions         and varying chain length,     -   wherein the alkyl moiety is selected from a group consisting of         methyl, ethyl, propyl, isopropyl, butyl isobutyl,     -   and wherein aryl or heteroaryl moiety has substitutions selected         from a group consisting of halo, alkyl with different chain         length, nitro, amino, and sulphonyl substitutions;     -   wherein the alkyl substituent is selected from a group         consisting of methyl, ethyl, propyl and higher homologues,     -   wherein the higher homologues are linear, branched or alicyclic         substituents,     -   wherein the alicyclic substituents are selected from a group         consisting of cyclopentane, cyclohexane, higher membered rings,         fused rings and aryl/heteroaryl substituted alkyl groups,     -   wherein the aryl/heteroaryl substituted alkyl groups are         benzylic or unsaturated alkyl groups further selected from a         group consisting of cinnamul, crotyl and prenyl substituents;     -   e) wherein R₅, R₆ and R₇ are independently selected from a group         consisting of H, one to ten carbon chain either linear or         branched, saturated or unsaturated at any position, and alkyl         group, wherein the alkyl group is optionally substituted with         OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR′, NRR′, NO₂,         F, Cl, Br, I, OSO₃H, SO₂R, CN, SiR′R′R″ and R,     -   wherein R, R′, R″ independently selected from a group consisting         of alkyl moiety, aryl moiety, heteroaryl moiety and         cyclicaliphatic ring with different substitutions.         wherein the method comprises: mixing the compound of general         formula 1 and a human cancer cell line selected from a group         consisting of a lung cell line (A549), a leukemia cell line         (THP1), a prostrate cell line (PC-3) and a colon cell line         (caco-2, colo205, HCT-115), and specifically inhibiting PI3K-α         or β isoform in the human cancer cell line.

In another embodiment of the invention, dosage of compound of general formula 1 is in the range of 20 mg/kg to 100 mg/kg.

In another embodiment of the invention, the representative compound A has a GI50 concentration in the range of 2.4 μM-2.6 μM when used for in vitro activity against colon and breast cancer cell lines.

In another embodiment of the invention, the representative compound A demonstrates >74% optimal growth inhibition in human cancer cell lines at a concentration of 10 μM.

In another embodiment of the invention, the representative compound E when used for in vitro activity against colon cancer cell lines increases sub-G1/G0 population and shows concentration dependent growth arrest in G1/G0 population and late apoptosis in colon cancer cell lines.

FIGURES AND TABLES

FIG. 1: In vitro cell line based anticancer activity of some representative boronic acid bearing liphagane compounds

FIGS. 3, 4 and 5: Shows binding studies of the compound A, Compound E, Liphagal and compound AZ

FIG. 1: Shows general structure of boronic acid bearing liphagane scaffold

FIG. 2. Results of structural binding (in silico) studies of Compound A with catalytic domain of PI3K-α

FIG. 3. Results of structural binding (in silico) studies of Compound E with catalytic domain of PI3K-α

FIG. 6: Shows general scheme for the synthesis of boronic acid containing compound of general formula 1 (compound 11)

FIG. 7: Typical scheme for the synthesis of compound A

FIG. 8: Typical scheme for the synthesis of compound AZ

FIG. 9: IC₅₀ results of Compound A by MTT assay on caco-2 cell line

FIG. 10: IC₅₀ results of Compound A by enzyme based assay (PI3K-α and β)

FIG. 11: IC₅₀ results of Compound A by enzyme based assay (PI3K-α and β). Graph showing IC₅₀ value of PI3K-α isoform for compound-AZ; Table 2: Showing IC₅₀ values of PI3K isoforms for compound AZ

FIG. 12: Cell cycle analysis of compound A

FIG. 13: Showing concentration dependent increase in apoptotic cell population for compound E

FIG. 14: Immunofluorescent microscopic analysis of CACO-2 cells using Phospho-Akt (Ser473) rabbit polyclonal IgG (labeled with texas red). A—Untreated cells, B and C—Cells treated with liphagal and compound E, 4 and 3 μM respectively for 24 hr showing inhibition of pAKT. Nuclei were stained blue with DAPI

ABBREVIATIONS

ACN: acetonitrile Ac: acetyl CDCl₃: deuterated chloroform CHCl₃: chloroform ¹³CNMR: carbon nuclear magnetic resonance DCM or CH₂Cl₂: dichloromethane DIPEA: diisopropyl ethyl amine DMF: dimethylformamide DMSO: dimethylsulfoxide EtOAc: ethylacetate h or hr: hour ¹HNMR: proton nuclear magnetic resonance IC₅₀: 50% inhibitory concentration IR: infrared J: coupling constant (Hz) MeOH: methanol

MHz: Megahertz

mg: milli gram μg: microgram μL: micro liter Mmol: milli mole MTT: mitochondrial membrane potential m/z: mass-to-charge ratio PI3-K: phosphatidylinositol-3-kinase TEA: triethyl amine TFA: trifluoroacetic acid THF: tetrahydrofuran TLC: thin layer chromatography TMA: trimethyl amine TMEDA: tetramethyl ethylene diamine

DETAILED DESCRIPTION OF THE INVENTION

In an embodiment of the present invention the Formula 1 represents different compounds of meroterpenoid based liphagane scaffold having boronic acid functionality at 6^(th) position of phenyl ring, wherein, R1 to R3 are independently selected from H, OH, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″, OCF₃, CF₃ and R. Wherein, R, R′, R″ may be alkyl, aryl, heteroaryl or any cyclicaliphatic ring with different substitutions.

In yet another embodiment, ‘Y’ is O, S, NH, and NR, wherein, R-may be substituted with alkyl, aryl, heteroaryl moiety or any cyclic aliphatic or aromatic system.

In an embodiment of the present invention, n and n1 are selected carbon chain length from 0, 1 and 2.

In an another embodiment, wherein, R₄ is H or OR or SR or SO₂R or OSO₃R or SiRR′R″ or NH₂ or NHR or NRR′ or a one to ten carbon chain either linear or branched, saturated or unsaturated alkyl group optionally substituted with OH, H, OH, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R′, CN, SiRR′R″ and R. Wherein, R, R′, R″ are alkyl, aryl, heteroaryl or cyclicaliphatic ring having substitutions with varying chain length.

In an embodiment, wherein, the substituent R₄ is also selected from a group consisting of hydrogen, alkyl substituents viz., methyl, ethyl, propyl and the higher homologues either linear of branched, including alicyclic such as cyclopentane, cyclohexane or higher membered rings, fused rings, aryl/heteroaryl substituted alkyl groups including benzylic or its higher homologues that might include unsaturated alkyl groups such as cinnamyl, crotyl and prenyl substituents.

In yet another embodiment of the present invention, wherein, R₅, R₆ and R₇ are H or one to ten carbon chain either linear or branched, saturated or unsaturated at any position, alkyl group optionally substituted with OH, H, OH, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR′, NR′, NR′R″, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″ and R. Here R, R′, R″ may be alkyl, aryl, heteroaryl or any cyclicaliphatic ring with different substitutions.

In embodiment of the present invention, R is independently selected from H or one to ten carbon chain either linear or branched, saturated or unsaturated, alkyl group optionally substituted with OH, H, OH, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″ and R. Here R, R′, R″ may be alkyl, aryl, heteroaryl or any cyclicaliphatic ring with different substitutions.

Wherein, further the substituent R at various positions is also selected from a group consisting of hydrogen, alkyl substituents viz., methyl, ethyl, propyl and the higher homologues either linear or branched, including alicyclic such as cyclopentane, cyclohexane or higher membered rings, fused rings aryl/heteroaryl substituted alkyl groups including benzylic or its higher homologues that might include unsaturated alkyl groups such as cinnamyl, crotyl and prenyl substituents.

In an embodiment in the present invention, the routine method was used for the in silico bioinformatics study of liphagal and its boronic acid based compounds, it is as mentioned below: all the computational studies were carried out in the Schrodinger suite 2010 molecular modeling software. The 2D structures of all the molecules were built in the maestro window. All the molecules were then converted to their respective 3D structure, with various conformers, tautomers and ionization states using the Ligprep and Confgen modules. The molecules were then minimized using the OPLS_(—)2005 force field. The 3D crystal structure of PI3Kα reported in Protein Data Bank (PDB) was used as receptor for docking studies (PDB ID: 3HHM). The protein was downloaded from the PDB and was prepared for docking using the Protein Preparation wizard. Hydrogen's were added to the protein and the missing loops were built. Bond length and bond order correction was also carried out for preparing the protein for docking studies. The active site grid was generated based on the already co-crystallised ligand of the receptor using receptor grid generation module. The ligands were docked on to the receptor through this grid using Glide module and flexible docking was carried out for all the conformers in order to find out the binding mode of these ligands. The extra precision (XP) scoring function of Glide was used for carrying out these studies. In yet another embodiment of the present invention, wherein, the results obtained in the in silico studies of liphagal and its boronic acids based compounds are as: based on the docking studies, it was found that the boronic acid analogues of liphagal bind with better affinity to PI3Kα than liphagal. The interaction studies show that boronic acid (OH) are involved in strong H-bond interactions with Val851 and Gln859, whereas liphagal is involved in H-bond interaction at one place only with Gln859. Also the dock score of boronic acid based compound was about −10 and that of liphagal was about −8.5, which shows a stronger affinity of boronic acid analogues towards PI3Kα.

EXAMPLES

The invention is further described by reference to following examples which are intended to illustrate and should not be construed to limit the scope of the present invention.

Materials and Method: Chemistry:

General: Solvents were purified according to the standard procedures, and reagents used were of highest purity available. All reactions were performed in flame-dried glass apparatus under argon/nitrogen atmosphere unless mentioned otherwise. Anhydrous solvents like CH₂Cl₂, Et₂O, THF, CH₃OH, CH₃CN, DMF, pyridine, Et₃N were freshly dried using standard methods. NMR measurements (¹H and ¹³C) were recorded on either 400 or 500 MHz spectrometer (Bruker) fitted with pulse-field gradient probe, and trimethylsilane (TMS) or residual resonance of deuterated solvent were used as internal reference. Chemical shifts are expressed in (δ) parts per million and coupling constants J in hertz. Mass spectra were recorded on ESI MS or MALDI-TOF/TOF MS/MS-MS spectrophotometer using 2,5-Dihydroxy benzoic acid/α-Cyano-4-hydroxy benzoic acid/Sinapinic acid (Sigma-Aldrich) as matrix in acetonitrile:water containing 0.01% TFA. Optical rotations were measured on a digital PerkinElmer-241 polarimeter. Analytical TLC was performed on Merck 60 F₂₅₄ plates, and compounds were visualized by spraying and charring with phosphomolybdic acid or 20% H₂SO₄ in MeOH as developing reagent. Preparative TLC was performed on pre-coated silica gel 60 F₂₅₄ plates (20×20 cm) purchased from Merck. Silica column chromatography was carried out with silica gel (100-200 mesh) or flash silica gel (230-400 mesh) purchased from Merck.

Example 1 Synthesis of Compound A

For steps 1 to 6 (Ref: Mehta, G; Likhite, N. S.; Ananda Kumar, C. S. Tet. Lett. 2009, 50, 5260.) The steps involved for the synthesis of compound A are described as below—

Step 1: Synthesis of 2-hydroxy, 4,5-dimethoxybenzaldehyde (A1)

To solution of 3,4,5-trimethoxybenzaldehyde (5 g, 25.5 mmol) in CH₂Cl₂ (125 ml) at 0° C. was added BBr₃ (6.39 g, 25.5 mmol). The resulting dark mixture was stirred at 0° C. for 10 hrs after completion of the reaction checked by TLC H₂O (100 mL) was then added and the mixture was stirred for 10 min and the aqueous phase was extracted by CH₂Cl₂. The organic phase was dried over Na₂SO₄, and evaporated under reduced pressure. The resulting residue was purified by silica gel (CH₂Cl₂) afforded the 2-hydroxy 4,5dimethoxybenzaldehyde A1 (4.3 g) in 87% yield isolated yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 11.33 (s, 1H), 9.63 (s, 1H), 6.83 (s, 1H), 6.40 (s, 1H), 3.87 (s, 3H), 3.81 (s, 3H) ppm. Mass: ESI [M+Na]⁺: 225.06; Elemental anal. calcd. for C₉H₁₀O₄; C, 59.34; H, 5.53; O, 35.13. found C, 59.14; H, 5.13; O, 34.90.

Step 2: Synthesis of 1-(5,6 dimethoxy benzofuran-2-yl)ethanone (A2)

To a solution of 2-hydroxy 4,5-dimethoxybenzaldehyde (2 g, 10.98 mmol) in butane-2-one (15 ml) added K₂CO₃ (6.07 g, 43.95 mmol) and then stirred at 0° C. for 10 min added bromoacetone (2.24 g, 16.47 mmol) and refluxed at 90° C. for 4 hr. After completion of the reaction butane-2-one was distilled off and water was added and extracted by ethylacetate twice. The EtOAc phase was dried over Na₂SO₄, Chromatography of the residue on silica gel (3:7 EtOAc/hexane) afforded the ketone A2 (1.69 g) in 70% yield pale yellow solid: ¹H NMR (500 MHz, CDCl₃) δ 7.29 (s, 1H), 7.04 (s, 1H), 6.98 (s, 1H), 3.94 (s, 3H), 3.90 (s, 3H), 2.30 (s, 3H) ppm. Mass: ESI [M+Na]⁺: 243.07; Elemental anal. calcd. for C₁₂H₁₂O₄; C, 65.45; H, 5.49. found C, 65.20; H, 5.25.

Step 3: Synthesis of 1-(5,6-dimethoxybenzofuran-2-yl)-5,9-dimethyldeca-4,8-dien-1-one (A3)

To a solution of 1-(5,6 dimethoxy benzofuran-2-yl)ethanone A2 (1 g, 4.545 mmol) in anhydrous Toluene added tBuOK (0.51 g, 4.545 mmol) at 0° C. under argon atmosphere and then stirred at the same temperature for 15 min to this reaction mixture geranyl bromide added drop wise. Resulting suspension stirred at the same temperature for 2 hrs. 50 ml water was added to the reaction mixture and layers were separated. Aqueous layer was extracted with ethylaectate. The combined organic extract were washed with brine and dried over Na₂SO₄, evaporated under reduced pressure. Chromatography of the residue on silica gel (5% EtOAc/hexanes) afforded the ketone A3 (1.69 g) in 70% yield pale yellow liquid: ¹H NMR (500 MHz, CDCl₃) δ 7.425 (s, 1H), 7.365 (s, 1H), 7.06 (s, 1H), 5.12-5.16 (m, 1H), 5.08-5.04 (m, 1H), 3.96 (s, 3H), 3.93 (s, 3H), 2.97-2.89 (t, 2H), 2.50-2.40 (m, 2H), 2.17-2.00 (m, 4H), 1.66 (s, 3H), 1.63 (s, 3H), 1.64 (s, 3H), 1.58 (s, 3H), ppm. Mass: ESI [M+Na]⁺: 379.2; Elemental anal. calcd. for C₂₂H₂₈O₄; C, 74.13; H, 7.92. found C, 74.0; H, 5.25.

Step 4: Synthesis of 5,6-dimethoxy-2-((E)-6,10-dimethylundeca-1,5,9-trien-2-yl)benzofuran (A4)

Triphenylphos-phenemethyl iodide (wittig salt, 2.247 g 5.6 mmol) has taken in a dry RBF kept in ice-salt mixture to this added dry THF (6 mL) to the resulting mixture nBuLi (2.5 mol in hexane 3.370, 8.4 mmol), was added drop wise until reaction mixture converted to yellow suspension. To the reaction mixture a solution of ketone (1 g, 2.8 mmol) in THF was added drop wise. Resulting suspension was stirred for 2 hrs. After completion of the reaction 10% ammonium chloride solution 30 ml was added and extracted by EtOAc. Chromatography of the residue on silica gel (3% EtOAc/Hexanes) afforded the compound A4 (0.79 g) in 80% yield colorless liquid: ¹H NMR (500 MHz, CDCl₃) δ 6.95 (s, 1H), 6.63 (s, 1H), 5.86 (s, 1H), 5.31-5.30 (d, 1H), 5.20-5.18 (d, 2H), 5.11-5.08 (t, 1H), 3.90 (s, 3H), 3.90 (s, 3H), 2.46-2.43 (t, 2H), 2.32-2.28 (q, 2H), 2.08-2.04 (q, 2H), 2.01-1.98 (t, 2H), 1.68 (s, 3H), 1.59 (s, 3H), 1.56 (s, 3H), ppm. Mass: ESI [M+Na]⁺: 377.22; Elemental anal. calcd. for C₂₃H₃₀O₃; C, 77.93; H, 8.53. found C, 77.55; H, 8.35.

Step 5: Synthesis of 5,6-dimethoxy-2-((E)-1,6,10-trimethylundeca-5,9-dien-2-yl)benzofuran (A5)

To a solution of compound A4 (0.7 g 1.9 mmol) in MeOH was added 10 Mol % Pd/C and reaction was shacked at 40 psi pressure for 0.5 hrs. After completion of the reaction (monitored by TLC) filtered the reaction mixture and evaporated the methanol completely. Chromatography of the residue on silica gel (3% EtOAc/Hexanes) afforded the compound A5 (0.633 g) in 90% yield colorless liquid: ¹H NMR (500 MHz, CDCl₃) δ 7.04 (s, 1H), 6.98 (s, 1H), 6.294 (s, 1H), 5.15-5.12 (m, 4H), 3.940 (s, 6H), 2.94-2.91 (m, 1H), 2.10-1.98 (m, 4H), 1.87-1.82 (m, 2H), 1.74 (s, 3H), 1.634 (s, 3H), 1.59 (s, 3H), 1.34-1.32 (d, 3H), ppm. Mass: ESI [M+Na]⁺: 356.24; Elemental anal. calcd. for C₂₃H₃₂O₃; C, 77.49; H, 9.05. found C, 77.49; H, 9.05.

Step 6: Synthesis of Compounds (A6)

To a solution of the benzofuran A5 (0.6 g, 1.6 mmol) in 2-nitropropane (25 mL), at −85° C. was added chlorosulfonic acid (0.977 g, 8.42 mmol). The resulting mixture was allowed to stir at −78° C. for 30 min. An aqueous solution of NaHCO₃ was then added and the aqueous phase was extracted with EtOAc. The EtOAc phase was dried over Na₂SO₄, filtered and evaporated under reduced pressure. Chromatography of the residue on silica gel (3% EtOAc/Hexanes) afforded the compounds A6 (0.3 g) in 50% yield colorless liquid with racemic mixture ¹H NMR (CDCl₃, 500 MHz) δ 7.13 (s, 1H), 6.85 (s, 1H), 3.89 (s, 3H), 3.88 (s, 3H), 2.56 (br d, J=14.1 Hz, 1H), 2.15 (m, 1H), 1.82 (m, 1H), 1.71 (qt, J=13.7, 3.5 Hz, 1H), 1.69 (m, 1H), 1.64-1.41 (m, 8H), 1.40 (d, J=7.2 Hz, 3H), 1.36 (s, 3H), 1.25 (ddd, J=13.3, 13.3, 3.5 Hz, 1H), 0.99 (s, 3H), 0.95 (s, 3H). Mass: ESI [M+Na]⁺: 356.24; Elemental anal. calcd. for C₂₃H₃₂O₃; C, 77.49; H, 9.05. found C, 77.49; H, 9.05.

Step 7: Synthesis of Compound (A7)

For the purpose of this application, compound A7 has been interchangeably referred to as compound E.

To a solution of benzofuran A6 (0.1 g, 0.281 mmol) in THF (1.5 mL) at 0° C. was added nBuLi (2.5 M in hexane). After stirring at this temperature for 20 min triethylborate was added. The mixture was stirred at rt for 1 hr. Aqueous NH₄Cl was added and the aqueous phase was extracted with EtOAc dried over Na₂SO₄, and evaporated under reduced pressure. Chromatography of the residue on silica gel (8% EtOAc/Hexanes) afforded the compounds A7 (0.05 g) in 50% white solid racemic mixture ¹H NMR (500 MHz, CDCl₃) δ 6.83 (s, 1H), 3.94 (s, 3H), 3.92 (s, 3H), 2.56-2.49 (m, 1H), 1.56-1.52 (m, 4H), 1.48 (s, 3H), 1.37 (s, 3H), 0.99 (s, 3H), 0.96 (d, 3H) ppm. Mass: ESI [M+Na]⁺: 400.24; Elemental anal. calcd. for C₂₃H₃₃BO₅; C, 69.01; H, 8.31; B, 2.70. found C, 69.10; H, 8.20; B, 2.50.

Step 8: Synthesis of Compound A

The solution of BI₃ in DCM was added slowly and drop wise in the round bottom flask containing solution of compound A7 in DCM at −78° C. The mixture of this was stirred at same temperature for half an hour the slowly raised to rt. The progress of reaction was monitored by TLC. The reaction mixture was neutralized using potassium thiosulphate solution and extracted with DCM solution and separated the organic layer, dried over sodium sulphate, concentrated in vaccuo. The crude was purified by column chromatography using hexane/EtOAc as eluent. ¹H NMR (500 MHz, CDCl₃) δ 6.83 (s, 1H), 2.56-2.49 (m, 1H), 1.56-1.52 (m, 4H), 1.48 (s, 3H), 1.37 (s, 3H), 0.99 (s, 3H), 0.96 (d, 3H) ppm. Mass: ESI [M+Na]⁺: 372.211; Elemental anal. calcd. for C₂₁H₂₉BO₅; C, 67.75; H, 7.85; B, 2.90. found C, 67.65; H, 7.61; B, 2.30.

All the compounds disclosed in formula 1, are prepared by employing the similar method containing different substitutions at R1, R2, R3 and R4 positions, as described for the preparation of compound A. The details of reaction conditions are depicted in the table given below—

Compound Reactions code Step 1 Step 2 Step 3 Step 4 Step 5 Compound A Starting 2,4,5- 2- 1-(5,6- (E)-1-(5,6- 5,6- material Trimethoxy hydroxy- dimethoxy dimethoxy dimethoxy- benzaldehyde 4,5- benzofuran- benzofuran- 2-((E)- dimethoxybenzaldehyde 2- 2-yl)-5,9- 6,10- yl)ethanone dimethyldeca- dimethylundeca- 4,8- 1,5,9- dien-1-one trien-2- yl)benzofuran Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound B Starting 2- 2- 1-(5,6- (E)-1-(5,6- 2-((E)- material methoxy- hydroxy- bis(trifluoromethoxy)benzofuran- bis(trifluoromethoxy)benzofuran- 6,10- 4,5- 4,5- 2- 2-yl)-5,9- dimethylundeca- bis(trifluoromethoxy)benzaldehyde bis(trifluoromethoxy)benzaldehyde yl)ethanone dimethyldeca- 1,5,9- 4,8- trien-2-yl)- dien-1-one 5,6- bis(trifluoromethoxy)benzofuran Solvent DCM Toluene Toluene THF MeOH Temperature 0° C. Reflux 0° C. 0° C. RT for 4 hrs Yield 85% 85% 60% 80% 95% Compound C Starting 4,5- 4,5- 1-(5,6- (E)-1-(5,6- 5,6- material bis(trifluoromethyl)- bis(trifluoromethyl)- bis(trifluoromethyl)benzofuran- bis(trifluoromethyl)benzofuran- bis(trifluoromethyl)- 2- 2- 2- 2-yl)-5,9- 2- methoxybenzaldehyde hydroxybenzaldehyde yl)ethanone dimethyldeca- ((E)-6,10- 4,8- dimethylundeca- dien-1-one 1,5,9- trien-2- yl)benzofuran Solvent DCM Toluene Toluene THF MeOH Temperature 0° C. Reflux 0° C. 0° C. RT for 4 hrs Yield 85% 85% 60% 80% 95% Compound D Starting 2- 2- 1-(5,6- (E)-1-(5,6- 5,6- material methoxy- hydroxy- dimethylbenzofuran- bis(trifluoromethyl)benzofuran- bis(trifluoromethyl)- 4,5- 4,5- 2- 2-yl)-5,9- 2- dimethylbenzaldehyde dimethylbenzaldehyde yl)ethanone dimethyldeca- ((E)-6,10- 4,8- dimethylundeca- dien-1-one 1,5,9- trien-2- yl)benzofuran Solvent DCM Toluene Toluene THF MeOH Temperature 0° C. Reflux 0° C. 0° C. RT for 4 hrs Yield 85% 85% 60% 80% 95% Compound E Starting 2,4,5- 2- 1-(5,6- (E)-1-(5,6- 5,6- material Trimethoxy hydroxy- dimethoxy dimethoxy dimethoxy- benzaldehyde 4,5- benzofuran- benzofuran- 2-((E)- dimethoxybenzaldehyde 2- 2-yl)-5,9- 6,10- yl)ethanone dimethyldeca- dimethylundeca- 4,8- 1,5,9- dien-1-one trien-2- yl)benzofuran Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound F Starting 4,5- 2- 1-(5,6- (E)-1-(5,6- 5,6- material diethyl- hydroxy- dimethoxybenzofuran- dimethoxybenzofuran- dimethoxy- 2- 4,5- 2- 2-yl)-5,9- 2-((E)- methoxybenzaldehyde dimethoxybenzaldehyde yl)ethanone dimethyldeca- 6,10- 4,8- dimethylundeca- dien-1-one 1,5,9- trien-2- yl)benzofuran Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound G Starting 6- 6- 1- (E)-1- 6-((E)- material methoxybenzo[d][1, hydroxybenzo[d][1, (benzofuro[6, (benzofuro[6, 6,10- 3]dioxole- 3]dioxole- 5- 5- dimethylundeca- 5- 5- d][1,3]dioxol- d][1,3]dioxol- 1,5,9- carbaldehyde carbaldehyde 6- 6-yl)- trien-2- yl)ethanone 5,9- yl)benzofuro[6, dimethyldeca- 5- 4,8- d][1,3]dioxole dien-1-one Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound H Starting 4- 4-amino- 1-(6- (E)-1-(6- 2-((E)- material amino- 2- amino-5- amino-5- 6,10- 2- hydroxy- morpholinobenzofuran- morpholinobenzofuran- dimethylundeca- methoxy- 5- 2- 2-yl)- 1,5,9- 5- morpholinobenzaldehyde yl)ethanone 5,9- trien-2-yl)- morpholinobenzaldehyde dimethyldeca- 5- 4,8- morpholinobenzofuran- benzofuran dien-1-one 6-amine Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound I Starting 4,5- 4,5- 1-(5,6- (E)-1-(5,6- 2-((E)- material diamino- diamino- diaminobenzofuran- diaminobenzofuran- 6,10- 2- 2- 2- 2-yl)-5,9- dimethylundeca- methoxybenzaldehyde hydroxybenzaldehyde yl)ethanone dimethyldeca- 1,5,9- 4,8- trien-2- dien-1-one yl)benzofuran- 5,6- diamine Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound J Starting 4,5- 4,5- 1-(5,6- (E)-1-(5,6- 2-((E)- material diamino- diamino- diaminobenzofuran- diaminobenzofuran- 6,10- 2- 2- 2- 2-yl)-5,9- dimethylundeca- methoxy hydroxybenzaldehyde yl)ethanone dimethyldeca- 1,5,9- benzaldehyde 4,8- trien-2- dien-1-one yl)benzofuran- 5,6- diamine Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound K Starting 2- 2- 1-(5,6- (E)-1-(5,6- N5,N6- material methoxy- hydroxy- bis(methylamino)benzofuran- bis(methylamino)benzofuran- dimethyl-2- 4,5- 4,5- 2- 2- ((E)-6,10- bis(methylamino)benzaldehyde bis(methylamino)benzaldehyde yl)ethanone yl)-5,9- dimethylundeca- dimethyldeca- 1,5,9- 4,8- trien-2- dien-1-one yl)benzofuran- 5,6- diamine Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound L Starting 6- 6- 1-(3H- (E)-1-(3H- 6-((E)- material methoxy- hydroxy- benzofuro[6, benzofuro[6, 6,10- 1H- 1H- 5- 5- dimethylundeca- benzo[d]imidazole- benzo[d]imidazole- d]imidazole- d]imidazole- 1,5,9- 5- 5- 6- 6-yl)-5,9- trien-2-yl)- carbaldehyde carbaldehyde yl)ethanone dimethyldeca- 3H- 4,8- benzofuro[6, dien-1-one 5- d]imidazole Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. 95% for 4 hrs Yield 84% 70% 50% 80% 95% Compound M Starting 4,5- 4,5- 1-(5,6- (E)-1-(5,6- 2-((E)- material diamino- diamino- diaminobenzofuran- diaminobenzofuran- 6,10- 2- 2- 2- 2-yl)-5,9- dimethylundeca- methoxybenzaldehyde hydroxybenzaldehyde yl)ethanone dimethyldeca- 1,5,9- 4,8- trien-2- dien-1-one yl)benzofuran- 5,6- diamine Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound N Starting 2- 1-(5,6- (E)-1-(5,6- 5,6- 5,6- material hydroxy- dimethoxybenzofuran- dimethoxybenzofuran- dimethoxy- dimethoxy- 4,5 2- 2-yl)- 2-((E)- 2-((E)- dimethoxybenzaldehyde yl)ethanone 5,9- 6,10- 6,10- dimethyldeca- dimethylundeca- dimethylundeca- 4,8- 1,5,9- 5,9- dien-1-one trien-2- dien-2- yl)benzofuran yl)benzofuran Solvent Butane2- Toluene THF MeOH 2- one nitropropane Temperature Reflux 0° C. 0° C. RT −78° C. for 4 hrs Yield 70% 50% 80% 95% 50% Compound O Starting 2- 1-(5,6- (E)-1-(5,6- 5,6- 5,6- material hydroxy- dimethoxybenzofuran- dimethoxybenzofuran- dimethoxy- dimethoxy- 4,5- 2- 2-yl)- 2-((E)- 2-((E)- dimethoxybenzaldehyde yl)ethanone 5,9- 6,10- 6,10- dimethyldeca- dimethylundeca- dimethylundeca- 4,8- 1,5,9- 5,9- dien-1-one trien-2- dien-2- yl)benzofuran yl)benzofuran Solvent Butane2- Toluene THF MeOH 2- one nitropropane Temperature Reflux 0° C. 0° C. RT −78° C. for 4 hrs Yield 70% 50% 80% 95% 50% Compound P Starting 4,5- 4,5- 1-(5,6- (E)-1-(5,6- 5,6- material bis(allyloxy)- bis(allyloxy)- bis(allyloxy)benzofuran- bis(allyloxy)benzofuran- bis(allyloxy)- 2- 2- 2- 2-yl)- 2-((E)- methoxybenzaldehyde hydroxybenzaldehyde yl)ethanone 5,9- 6,10- dimethyldeca- dimethylundeca- 4,8- 1,5,9- dien-1-one trien-2- yl)benzofuran Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound Q Starting 4- 4-formyl- 2- 2-((E)-5,9- 2-((E)- material formyl- 5- acetylbenzofuran- dimethyldeca- 6,10- 5- hydroxybenzene- 5,6- 4,8- dimethylundeca- methoxybenzene- 1,2- dicarbonitro dienoyl)benzofuran- 1,5,9- 1,2- dinitro 5,6- trien-2- dinitro dicarbonitro yl)benzofuran- 5,6- dicarbonitro Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound R Starting 4- 4-formyl- 2- 2-((E)-5,9- 2-((E)- material formyl- 5- acetylbenzofuran- dimethyldeca- 6,10- 5- hydroxybenzene- 5,6- 4,8- dimethylundeca- methoxybenzene- 1,2- dicarbonitrile dienoyl)benzofuran- 1,5,9- 1,2- dinitrile 5,6- trien-2- dinitrile dicarbonitrile yl)benzofuran- 5,6- dicarbonitrile Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound S Starting 4,5- 4,5- 1-(5,6- (E)-1-(5,6- 5,6- material difluoro- difluoro- dicfluorobenzofuran- difluorobenzofuran- difluoro-2- 2- 2- 2- 2-yl)-5,9- ((E)-6,10- methoxybenzaldehyde hydroxybenzaldehyde yl)ethanone dimethyldeca- dimethylundeca- 4,8- 1,5,9- dien-1-one trien-2- yl)benzofuran Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound T Starting 4,5- 4,5- 1-(5,6- (E)-1-(5,6- 5,6- material dichloro- dichloro- dichlorobenzofuran- dichlorobenzofuran- dichloro-2- 2- 2- 2- 2-yl)-5,9- ((E)-6,10- methoxybenzaldehyde hydroxybenzaldehyde yl)ethanone dimethyldeca- dimethylundeca- 4,8- 1,5,9- dien-1-one trien-2- yl)benzofuran Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound U Starting 2- 1-(5,6- (E)-1-(5,6- 5,6- 5,6- material amino- dimethoxy- dimethoxy- dimethoxy- dimethoxy- 4,5- 1H- 1H-indol- 2-((E)- 2-((E)- dimethoxybenzaldehyde indol-2- 2-yl)-5,9- 6,10- 6,10- yl)ethanone dimethyldeca- dimethylundeca- dimethylundeca- 4,8- 1,5,9- 5,9- dien-1-one trien-2- dien-2-yl)- yl)benzo[b]thiophene 1H-indole Solvent Butane2- Toluene THF MeOH 2- one nitropropane Temperature Reflux 0° C. 0° C. RT −78° C. for 4 hrs Yield 70% 50% 80% 95% 50% Compound V Starting 2- 1-(5,6- (E)-1-(5,6- 5,6- 5,6- material mercapto- dimethoxybenzo[b]thiophen- dimethoxybenzo[b]thiophen- dimethoxy- dimethoxy- 4,5- 2- 2- 2-((E)- 2-((E)- dimethoxybenzaldehyde yl)ethanone yl)-5,9- 6,10- 6,10- dimethyldeca- dimethylundeca- dimethylundeca- 4,8- 1,5,9- 5,9- dien-1-one trien-2- dien-2- yl)benzo[b]thiophene yl)benzo[b]thiophene Solvent Butane2- Toluene THF MeOH 2- one nitropropane Temperature Reflux 0° C. 0° C. RT −78° C. for 4 hrs Yield 70% 50% 80% 95% 50% Compound W Starting 2- 1-(5,6- (E)-1-(5,6- 5,6- 5,6- material hydroxy- dimethoxybenzofuran- dimethoxybenzofuran- dimethoxy- dimethoxy- 4,5- 2- 2-yl)- 2-((E)- 2-((E)- dimethoxybenzaldehyde yl)ethanone 5,9- 6,10- 6,10- dimethyldeca- dimethylundeca- dimethylundeca- 4,8- 1,5,9- 5,9- dien-1-one trien-2- dien-2- yl)benzofuran yl)benzofuran Solvent Butane2- Toluene THF MeOH 2- one nitropropane Temperature Reflux 0° C. 0° C. RT −78° C. for 4 hrs Yield 70% 50% 80% 95% 50% Compound X Starting 2- 1-(5,6- 1-(5,6- (E)-1-(5,6- 5,6- material amino- dimethoxy- dimethoxy- dimethoxy- dimethoxy- 4,5- 1- 1H-indol- 1-methyl- 1-methyl-2- dimethoxybenzaldehyde methyl- 2- 1H-indol- ((E)-6,10- 1H-indol- yl)ethanone 2-yl)-5,9- dimethylundeca- 2- dimethyldeca- 1,5,9- yl)ethanone 4,8- trien-2-yl)- dien-1-one 1H-indole Solvent Butane2- THF Toluene THF MeOH one Temperature Reflux rt 0° C. 0° C. RT for 4 hrs Yield 70% 60% 50% 80% 95% Compound Y Starting 2- 1-(5,6- 1-(5,6- (E)-1-(5,6- 5,6- material amino- dimethoxy- dimethoxy- dimethoxy- dimethoxy- 4,5- 1- 1H-indol- 1-methyl- 1-methyl-2- dimethoxybenzaldehyde methyl- 2- 1H-indol- ((E)-6,10- 1H-indol- yl)ethanone 2-yl)-5,9- dimethylundeca- 2- dimethyldeca- 1,5,9- yl)ethanone 4,8- trien-2-yl)- dien-1-one 1H-indole Solvent Butane2- THF Toluene THF MeOH one Temperature Reflux rt 0° C. 0° C. RT for 4 hrs Yield 70% 60% 50% 80% 95% Compound Z Starting 2,4,5- 2- 1-(5,6- (E)-1-(5,6- 5,6- material Trimethoxybenzaldehyde hydroxy- dimethoxybenzofuran- dimethoxybenzofuran- dimethoxy- 4,5- 2- 2-yl)-5,9- 2-((E)- dimethoxybenzaldehyde yl)ethanone dimethyldeca- 2,7,11- 4,8- trimethyldodeca- dien-1-one 2,6,10- trien-3- yl)benzofuran Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound Starting 2- 2- 1-(5,6- (E)-1-(5,6- 5,6- AA material methoxy, hydroxy- diaceoxybenzofuran- diaceoxybenzofuran- diacetoxy- 4,5- 4,5- 2- 2-yl)-5,9- 2-((E)- Diacetoxy acetoxybenzaldehyde yl)ethanone dimethyldeca- 6,10- benzaldehyde 4,8- dimethylundeca- dien-1-one 1,5,9- trien-2- yl)benzofuran Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound Starting 2- 1-(5,6- (E)-1-(5,6- 2-((E)- 2-((E)- AB material amino,4, diAcetylamino- diacetylamino- 6,10- 6,10- 5- 1H- 1H- dimethylundeca- dimethylundeca- diacetyl indol-2- indol-2- 1,5,9- 5,9- amino yl)ethanone yl)-5,9- trien-2-yl)- dien-2-yl)- benzaldehyde dimethyldeca- 1H-indole- 1H-indole- 4,8- 5,6- 5,6- dien-1-one diacetylamine diacetylamine Solvent Butane2- Toluene THF MeOH 2- one nitropropane Temperature Reflux 0° C. 0° C. RT −78° C. for 4 hrs Yield 70% 50% 80% 95% 60% Compound Starting 4,5- 4,5- 1-(5,6- (E)-1-(5,6- N5,N5,N6, AC material bis(dimethylamino)- bis(dimethylamino)- bis(dimethylamino)benzofuran- bis(dimethylamino)benzofuran- N6- 2- 2- 2- 2-yl)-5,9- tetramethyl- methoxybenzaldehyde hydroxybenzaldehyde yl)ethanone dimethyldeca- 2-((E)- 4,8- 6,10- dien-1-one dimethylundeca- 1,5,9- trien-2- yl)benzofuran- 5,6- diamine Solvent Dchloro Butane2- Toluene THF MeOH methane one Temperature RT Reflux 0° C. 0° C. RT for 4 hrs Yield 84% 70% 50% 80% 95% Compound Starting 2- 1-(5,6- (E)-1-(5,6- 5,6- Tetracyclic AD material hydroxy- dimethoxybenzofuran- dimethoxybenzofuran- dimethoxy- intermediate 4,5- 2- 2-yl)- 2-((E)-5,9- of dimethoxybenzaldehyde yl)ethanone 5,9- dimethyldeca- liphagal dimethyldeca- 4,8- 4,8- dienyl)benzofuran dien-1-one Solvent Butane2- Toluene THF 2- THF one nitropropane Temperature Reflux 0° C. rt −78° C. 0-5° C. for 4 hrs Yield 70% 50% 85% 50% 50% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AE material dimethoxybenzofuran- (5,6- dimethoxy- intermediate intermediate 2- dimethoxybenzofuran- 2-((E)- of of yl)ethanone 2-yl)- 5,9- liphagal liphagal 5,9- dimethyldeca- with keto dimethyldeca- 4,8- group at 4,8- dienyl)benzofuran 10^(th) dien-1- posotion one Solvent Toluene THF 2- Doxane MeOH nitropropane Temperature 0° C. rt −78° C. 80° C. rt Yield 50% 85% 50% 60% 90% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AF material dimethoxybenzofuran- (5,6- dimethoxy- intermediate boronic 2- dimethoxybenzofuran- 2-((E)- of acid yl)ethanone 2-yl)- 5,9- liphagal intermediate 5,9- dimethyldeca- of dimethyldeca- 4,8- desmetyl 4,8- dienyl)benzofuran liphagal dien-1- one Solvent Toluene THF 2- THF Dioxane nitropropane Temperature 0° C. rt −78° C. 0° C. to rt reflux Yield 50% 85% 50% 80% 60% Compound Starting (E)-1- 5,6- Tetracyclic Tetracyclic Tetracyclic AG material (5,6- dimethoxy- intermediate intermediate intermediate dimethoxybenzofuran- 2-((E)- of of of 2- 5,9- liphagal liphagal liphagal yl)-5,9- dimethyldeca- boronic boronic dimethyldeca- 4,8- acid acid with 4,8- dienyl)benzofuran ktone at dien-1- 10^(th) one position Solvent THF 2- THF Doxane DCM nitropropane Temperature rt −78° C. 0-5° C. 80° C. −78° C. to rt Yield 85% 50% 50% 60% 50% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AH material dimethoxybenzofuran- (5,6- dimethoxy- intermediate boronic 2- dimethoxybenzofuran- 2-((E)- of acid yl)ethanone 2-yl)- 5,9- liphagal intermediate 5,9- dimethyldeca- of dimethyldeca- 4,8- desmetyl 4,8- dienyl)benzofuran liphagal dien-1- one Solvent Toluene THF 2- THF Dioxane nitropropane Temperature 0° C. rt −78° C. 0° C. to rt reflux Yield 50% 85% 50% 80% 60% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AI material dimethoxybenzofuran- (5,6- dimethoxy- intermediate boronic 2- dimethoxybenzofuran- 2-((E)- of acid yl)ethanone 2-yl)- 5,9- liphagal intermediate 5,9- dimethyldeca- of dimethyldeca- 4,8- desmetyl 4,8- dienyl)benzofuran liphagal dien-1- one Solvent Toluene THF 2- THF Dioxane nitropropane Temperature 0° C. rt −78° C. 0° C. to rt reflux Yield 50% 85% 50% 80% 60% Compound Starting 5,6- Tetracyclic Tetracyclic Tetracyclic 5,6- AJ material dimethoxy- intermediate intermediate intermediate Dihydroxy 2- of of of Tetracyclic ((E)-5,9- liphagal liphagal liphagal intermediate dimethyldeca- boronic boronic of 4,8- acid acid with liphagal dienyl)benzofuran ktone at boronic 10^(th) acid with position ktone at 10^(th) position Solvent 2- THF Doxane DCM MeOH nitropropane Temperature −78° C. 0-5° C. 80° C. −78° C. to rt rt Yield 50% 50% 60% 50% 90% Compound Starting (E)-1- 5,6- Tetracyclic Tetracyclic Tetracyclic AK material (5,6- dimethoxy- intermediate derivative derivative dimethoxybenzofuran- 2-((E)- of Desmethyl of liphagal of liphagal 2- 5,9- liphagal with Keto with yl)-5,9- dimethyldeca- group at Hydroxy dimethyldeca- 4,8- 10^(th) group at 4,8- dienyl)benzofuran position 10^(th) dien-1- position one Solvent THF 2- Doxane MeOH THF nitropropane Temperature rt −78° C. reflux rt rt Yield 85% 50% 60% 90% 50% Compound Starting (E)-1- 5,6- Tetracyclic Tetracyclic Tetracyclic AL material (5,6- dimethoxy- intermediate derivative derivative dimethoxybenzofuran- 2-((E)- of Desmethyl of liphagal of liphagal 2- 5,9- liphagal with Keto with yl)-5,9- dimethyldeca- group at Hydroxy dimethyldeca- 4,8- 10^(th) group at 4,8- dienyl)benzofuran position 10^(th) dien-1- position one Solvent THF 2- Doxane MeOH THF nitropropane Temperature rt −78° C. reflux rt rt Yield 85% 50% 60% 90% 50% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AM material dimethoxybenzofuran- (5,6- dimethoxy- intermediate intermediate 2- dimethoxybenzofuran- 2-((E)- of of yl)ethanone 2-yl)- 5,9- liphagal liphagal 5,9- dimethyldeca- with keto dimethyldeca- 4,8- group at 4,8- dienyl)benzofuran 10^(th) dien-1- posotion one Solvent Toluene THF 2- Doxane MeOH nitropropane Temperature 0° C. rt −78° C. 80° C. rt Yield 50% 85% 50% 60% 90% Compound Starting (E)-1- 5,6- Tetracyclic Tetracyclic Tetracyclic AN material (5,6- dimethoxy- intermediate derivative derivative dimethoxybenzofuran- 2-((E)- of Desmethyl of liphagal of liphagal 2- 5,9- liphagal with Keto with yl)-5,9- dimethyldeca- group at Hydroxy dimethyldeca- 4,8- 10^(th) group at 4,8- dienyl)benzofuran position 10^(th) dien-1- position one Solvent THF 2- Doxane MeOH THF nitropropane Temperature rt −78° C. reflux rt rt Yield 85% 50% 60% 90% 50% Compound Starting (E)-1- 5,6- Tetracyclic Tetracyclic Tetracyclic AO material (5,6- dimethoxy- intermediate derivative derivative dimethoxybenzofuran- 2-((E)- of Desmethyl of liphagal of liphagal 2- 5,9- liphagal with Keto with yl)-5,9- dimethyldeca- group at Hydroxy dimethyldeca- 4,8- 10^(th) group at 4,8- dienyl)benzofuran position 10^(th) dien-1- position one Solvent THF 2- Doxane MeOH THF nitropropane Temperature rt −78° C. reflux rt rt Yield 85% 50% 60% 90% 50% Compound Starting (E)-1- 5,6- Tetracyclic Tetracyclic Tetracyclic AP material (5,6- dimethoxy- intermediate derivative derivative dimethoxybenzofuran- 2-((E)- of Desmethyl of liphagal of liphagal 2- 5,9- liphagal with Keto with yl)-5,9- dimethyldeca- group at Hydroxy dimethyldeca- 4,8- 10^(th) group at 4,8- dienyl)benzofuran position 10^(th) dien-1- position one Solvent THF 2- Doxane MeOH THF nitropropane Temperature rt −78° C. reflux rt rt Yield 85% 50% 60% 90% 50% Compound Starting 2- 1-(5,6- (E)-1-(5,6- 5,6- 5,6- AQ material hydroxy- dimethoxybenzofuran- dimethoxybenzofuran- dimethoxy- dimethoxy- 4,5- 2- 2-yl)- 2-((E)- 2-((E)- dimethoxybenzaldehyde yl)ethanone 5,9- 6,10- 6,10- dimethyldeca- dimethylundeca- dimethylundeca- 4,8- 1,5,9- 5,9- dien-1-one trien-2- dien-2- yl)benzofuran yl)benzofuran Solvent Butane2- Toluene THF MeOH 2- one nitropropane Temperature Reflux 0° C. 0° C. RT −78° C. for 4 hrs Yield 70% 50% 80% 95% 50% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AR material dimethoxybenzofuran- (5,6- dimethoxy- intermediate boronic 2- dimethoxybenzofuran- 2-((E)- of acid yl)ethanone 2-yl)- 5,9- liphagal intermediate 5,9- dimethyldeca- of dimethyldeca- 4,8- desmetyl 4,8- dienyl)benzofuran liphagal dien-1- one Solvent Toluene THF 2- THF Dioxane nitropropane Temperature 0° C. rt −78° C. 0° C. to rt reflux Yield 50% 85% 50% 80% 60% Compound Starting 1-(5,6- (E)-1- 5,6- 5,6- Tetracyclic AS material dimethoxybenzofuran- (5,6- dimethoxy- dimethoxy- Dimethoxy 2- dimethoxybenzofuran- 2-((E)- 2-((E)- liphagal yl)ethanone 2-yl)- 6,10- 6,10- intermediate 5,9- dimethylundeca- dimethylundeca- dimethyldeca- 1,5,9- 5,9- 4,8- trien-2- dien-2- dien-1- yl)benzofuran yl)benzofuran one Solvent Toluene THF MeOH 2- THF nitropropane Temperature 0° C. 0° C. RT −78° C. 0-5° C. Yield 50% 80% 95% 50% 50% Compound Starting 1-(5,6- (E)-1- 5,6- 5,6- Tetracyclic AT material dimethoxybenzofuran- (5,6- dimethoxy- dimethoxy- Dimethoxy 2- dimethoxybenzofuran- 2-((E)- 2-((E)- liphagal yl)ethanone 2-yl)- 6,10- 6,10- intermediate 5,9- dimethylundeca- dimethylundeca- dimethyldeca- 1,5,9- 5,9- 4,8- trien-2- dien-2- dien-1- yl)benzofuran yl)benzofuran one Solvent Toluene THF MeOH 2- THF nitropropane Temperature 0° C. 0° C. RT −78° C. 0-5° C. Yield 50% 80% 95% 50% 50% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AU material dimethoxybenzofuran- (5,6- dimethoxy- intermediate boronic 2- dimethoxybenzofuran- 2-((E)- of acid yl)ethanone 2-yl)- 5,9- liphagal intermediate 5,9- dimethylundeca- of dimethyldeca- 4,8- desmetyl 4,8- dienyl)benzofuran liphagal dien-1- one Solvent Toluene THF 2- THF Dioxane nitropropane Temperature 0° C. rt −78° C. 0° C. to rt reflux Yield 50% 85% 50% 80% 60% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AV material dimethoxy- (5,6- dimethoxy- intermediate intermediate 1H- dimethoxy- 2-((E)- of 5,6- of 5,6- indol-2- 1H- 5,9- dimethoxy dimethoxy yl)ethanone indol-2- dimethyldeca- indole indole yl)-5,9- 4,8- Derivative Derivative dimethyldeca- dienyl)- of liphagal of Liphagal 4,8- 1H-indole with keto dien-1- group at one 10^(th) position Solvent Toluene THF 2- Dioxane MeOH nitropropane Temperature 0° C. 0° C. −78° C. reflux rt Yield 50% 80% 50% 60% 90% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AW material dimethoxybenzo[b]thiophen- (5,6- dimethoxy- 5,6- 5,6- 2- dimethoxybenzo[b]thiophen- 2-((E)- dimethoxybenzo[b]thiophen dimethoxybenzo[b]thiophen yl)ethanone 2-yl)- 5,9- derivative derivative 5,9- dimethyldeca- of liphagal of Liphagal dimethyldeca- 4,8- with keto 4,8- dienyl)benzo[b]thiophene group at dien-1- 10^(th) one posistion Solvent Toluene THF 2- Dioxane MeOH nitropropane Temperature 0° C. 0° C. −78° C. reflux rt Yield 50% 80% 50% 60% 90% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AX material dimethoxy- (5,6- dimethoxy- intermediate intermediate 1H- dimethoxy- 2-((E)- of 5,6- of 5,6- indol-2- 1H- 5,9- dimethoxy dimethoxy yl)ethanone indol-2- dimethyldeca- indole indole yl)-5,9- 4,8- Derivative Derivative dimethyldeca- dienyl)- of liphagal of Liphagal 4,8- 1H-indole with keto dien-1- group at one 10^(th) position Solvent Toluene THF 2- Dioxane MeOH nitropropane Temperature 0° C. 0° C. −78° C. reflux rt Yield 50% 80% 50% 60% 90% Compound Starting 1-(5,6- (E)-1- 5,6- Tetracyclic Tetracyclic AY material dimethoxybenzofuran- (5,6- dimethoxy- intermediate intermediate 2- dimethoxybenzofuran- 2-((E)- of of yl)ethanone 2-yl)- 5,9- liphagal liphagal 5,9- dimethyldeca- with keto dimethyldeca- 4,8- group at 4,8- dienyl)benzofuran 10^(th) dien-1- posotion one Solvent Toluene THF 2- Doxane MeOH nitropropane Temperature 0° C. rt −78° C. 80° C. rt Yield 50% 85% 50% 60% 90% Compound Starting 2,4,5- 4,5- (4,5- 4,5- Tricyclic AZ material trimethoxybenzaldehyde dimethoxy- dimethoxy- dimethoxy, sixmembered 2- 2- 2- derivative (methoxymethoxy)benzaldehyde (methoxymethoxy)phenyl)methanol mathoxymethylbenzylphonium of liphagal salt Solvent DCM MeOH ACN DCM/THF 2- nitropropane Temperature 0° C. rt reflux Rt to reflux −78° C. Yield 87% 98% 98% 93% 90% Compound Reactions code Step 6 Step 7 Step 8 Compound A Starting 5,6- Tetracyclic Dimethoxy material dimethoxy- Dimethoxy Liphagal 2-((E)- liphagal boronic 6,10- intermediate acid dimethylundeca- intermediate 5,9- dien-2- yl)benzofuran Solvent 2- THF DCM nitropropane Temperature −78° C. 0-5° C. −78° C. to rt Yield 50% 50% 40% Compound B Starting 2-((E)- Tetracyclic material 6,10- bis(trifluoromethoxy) dimethylundeca- liphagal 5,9- intermediate dien-2-yl)- 5,6- bis(trifluoromethoxy)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 50% Compound C Starting 5,6- Tetracyclic material bis(trifluoromethyl)- bis(trifluoromethoxy) 2-((E)- liphagal 6,10- intermediate dimethylundeca- 5,9- dien-2- yl)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 55% Compound D Starting 5,6- Tetracylic material dimethyl- dimethyl 2-((E)- liphagal 6,10- intermediate dimethylundeca- 5,9- dien-2- yl)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 50% Compound E Starting 5,6- Tetracyclic material dimethoxy- 5,6- 2-((E)- dimethoxy 6,10- liphagal dimethylundeca- intermediate 5,9- dien-2- yl)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 70% Compound F Starting 5,6- Tetracylclic material dimethoxy- 5,6- 2-((E)- diethyl 6,10- lipghal dimethylundeca- intermediate 5,9- dien-2- yl)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 58% Compound G Starting 6-((E)- Tetracyclic material 6,10- benzofuro[6, dimethylundeca- 5- 5,9- d][1,3]dioxole dien-2- liphagla yl)benzofuro[6, intermediate 5- d][1,3]dioxole Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 50% Compound H Starting 2-((E)- material 6,10- dimethylundeca- 5,9- dien-2-yl)- 5- morpholinobenzofuran- 6-amine Solvent 2- nitropropane Temperature −78° C. Yield 50% Compound I Starting 2-((E)- material 6,10- dimethylundeca- 5,9- dien-2- yl)benzofuran- 5,6- diamine Solvent 2- nitropropane Temperature −78° C. Yield 50% Compound J Starting 2-((E)- Tetracyclic material 6,10- 5,6- dimethylundeca- diamino 5,9- Liphagal dien-2- intermediate yl)benzofuran- 5,6- diamine Solvent 2- Aceticanhydride nitropropane Temperature −78° C. rt Yield 50% 80% Compound K Starting N5,N6- material dimethyl- 2-((E)- 6,10- dimethylundeca- 5,9- dien-2- yl)benzofuran- 5,6- diamine Solvent 2- nitropropane Temperature −78° C. Yield 50% Compound L Starting 6-((E)- material 6,10- dimethylundeca- 5,9- dien-2-yl)- 3H- benzofuro[6, 5- d]imidazole Solvent 2- nitropropane Temperature −78° C. Yield 50% Compound M Starting 2-((E)- Tetracyclic Tertacyclic material 6,10- 5,6- 5,6- dimethylundeca- Diamine diamine 5,9- derivative derivative dien-2- of of yl)benzofuran- Liphagal Liphagal 5,6- boronic diamine acid Solvent 2- THF THF nitropropane Temperature −78° C. 0-5° C. 0° C. Yield 50% 60% 50% Compound N Starting Tetracyclic Dimethoxy 5,6- material Dimethoxy Liphagal Dihydroxy liphagal boronic tetracyclic intermediate acid liphagal intermediate borinc acid Solvent THF DCM 2-nitro propane Temperature 0-5° C. −78° C. to rt 0° C. Yield 50% 40% 55% Compound O Starting Tetracyclic Dimethoxy 5,6- material Dimethoxy Liphagal Dihydroxy liphagal boronic tetracyclic intermediate acid liphagal intermediate borinc acid Solvent THF DCM 2-nitro propane Temperature 0-5° C. −78° C. to rt 0° C. Yield 50% 40% 55% Compound P Starting 5,6- Tetracyclic material bis(allyloxy)- 5,6- 2-((E)- bis(allyloxy) 6,10- Liphagal dimethylundeca- intermediate 5,9- 2- yl)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 55% Compound Q Starting 2-((E)- Tetracyclic material 6,10- 5,6- dimethylundeca- Dinitro 5,9- substituted dien-2- Liphagal yl)benzofuran- intermediate 5,6- dicarbonitro Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 45% Compound R Starting 2-((E)- Tetracyclic material 6,10- 5,6- dimethylundeca- Dinitro 5,9- substituted dien-2- Liphagal yl)benzofuran- intermediate 5,6- dicarbonitrile Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 60% Compound S Starting 5,6- Tetracyclic material difluoro-2- 5,6- ((E)-6,10- difluoro dimethylundeca- intermediate 5,9- dien-2- yl)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 50% Compound T Starting 5,6- Tetracyclic material dichloro-2- 5,6- ((E)-6,10- dichloro dimethylundeca- intermediate 5,9- of dien-2- Liphagal yl)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 50% Compound U Starting Tetracyclic Tetracyclic material 5,6- 5,6- Dimethoxy Dimethoxy substituted substituted indole indole analogue of analogue lihagal of lihagal Boronic acid Solvent THF DCM Temperature 0-5° C. −78° C. to rt Yield 50% 40% Compound V Starting Tetracyclic Tetracyclic material 5,6- 5,6- Dimethoxy Dimethoxy substituted substituted indole indole analogue of analogue lihagal of lihagal boronic acid Solvent THF DCM Temperature 0-5° C. −78° C. to rt Yield 50% 40% Compound W Starting Tetracyclic Tetracyclic Tetracyclic material Dimethoxy Dimethoxy Dimethoxy liphagal benzopyran benzopyran intermediate intermediate intermediate of of liphagal Liphagal boronic acid Solvent nitromethane THF DCM Temperature 0-5° C. 0° C. to rt −78° C. to RT Yield 50% 60% 45% Compound X Starting 5,6- Tetracyclic Tetracyclic material dimethoxy- 5,6- 5,6- 1-methyl- dimethoxy dimethoxy 2-((E)- substituted substituted 6,10- N-methyl N- dimethylundeca- indole methyl 5,9- analogue indole dien-2-yl)- of analogue 1H-indole liaphagal of liaphagal boronic acid Solvent 2- THF DCM nitropropane Temperature −78° C. 0-5° C. −78° C. to rt Yield 50% 56% 45% Compound Y Starting 5,6- Tetracyclic material dimethoxy- 5,6- 1-methyl- dimethoxy 2-((E)- substituted 6,10- N-methyl dimethylundeca- indole 5,9- analogue dien-2-yl)- of 1H-indole liaphagal Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 60% Compound Z Starting 5,6- Tetracyclic Dimethoxy material dimethoxy- Dimethoxy Liphagal 2-((E)- liphagal boronic 2,7,11- derivative acid trimethyldodeca- derivative 6,10- dien-3- yl)benzofuran Solvent 2- THF DCM nitropropane Temperature −78° C. 0-5° C. −78° C. to rt Yield 50% 50% 50% Compound Starting 5,6- Tetracyclic AA material diacetoxy- Diacetoxy 2-((E)- liphagal 6,10- intermediate dimethylundeca- 5,9- dien-2- yl)benzofuran Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 50% Compound Starting Tetracyclic AB material Diacetylamino indole derivative of liphagal Solvent THF Temperature 0-5° C. Yield 40% Compound Starting N5,N5,N6, N5,N5,N6, AC material N6- N6- tetramethyl- tetramethyl- 2-((E)- substituted 6,10- derivative dimethylundeca- of liphagal 5,9- dien-2- yl)benzofuran- 5,6- diamine Solvent 2- THF nitropropane Temperature −78° C. 0-5° C. Yield 50% 50% Compound Starting Tetracyclic Tetracyclic AD material intermediate intermediate of of liphagal liphagal boronic boronic acid acid with ktone at 10^(th) position Solvent Doxane DCM Temperature 80° C. −78° C. to rt Yield 60% 50% Compound Starting Tetracyclic 5,6- 5,6- AE material intermediate Hydroxy,Tetracyclic Hydroxy,Tetracyclic of intermediate intermediate Liphagal of of with liphagal liphagal hydroxy with boronic group at trifluoromethoxy acid with 10^(th) group at trifluoromethoxy position 10^(th) at position 10^(th) position Solvent THF THF DCM Temperature -rt 0° C. to rt 0° C. Yield 60% 80% 40% Compound Starting Tetracyclic Tetracyclic 5,6- AF material intermediate intermediate Dhydroxy of of Tetracyclic Liphagal Liphagal intermediate boronic boronic of acid acid Liphagal intermediate intermediate boronic with Keto with acid group at Hydroxy intermediate 10^(th) group at with position 10^(th) Hydroxy position group at 10^(th) position Solvent MeOH DCM DCM Temperature rt −78° C. to rt rt Yield 80% 50% 45% Compound Starting 5,6- 5,6- 5,6- AG material Dihydroxy Dihydroxy Dihydroxy Tetracyclic Tetracyclic Tetracyclic intermediate intermediate intermediate of of of liphagal liphagal liphagal boronic boronic boronic acid with acid with acid with ktone at hydroxy at azide at 10^(th) 10^(th) 10^(th) position position position Solvent MeOH DCM MeOH Temperature rt rt rt Yield 90% 80% 80% Compound Starting Tetracyclic Tetracyclic AH material intermediate intermediate of 1 of Liphagal Liphagal boronic boronic acid acid intermediate intermediate with Keto with group at Hydroxy 10^(th) group at position 10^(th) position Solvent MeOH DCM Temperature rt −78° C. to rt Yield 80% 45%0% Compound Starting Tetracyclic Tetracyclic 5,6- AI material derivative derivative Hydroxy,Tetracyclic of Liphagal of intermediate boronic Liphagal of acid boronic liphagal intermediate acid boronic with Keto intermediate acid with group at with Hydroxy 10^(th) Hydroxy at 10^(th) position group at position 10^(th) position Solvent MeOH THF AC₂O Temperature rt 0° C. to rt 0° C. Yield 80% 80% 50% Compound Starting 5,6- 5,6- 5,6- AJ material Dihydroxy Dihydroxy Dihydroxy Tetracyclic Tetracyclic Tetracyclic intermediate intermediate intermediate of of of liphagal liphagal liphagal boronic boronic boronic acid with acid with acid with hydroxy at azide at azide at 10^(th) 10^(th) 10^(th) position position position Solvent DCM MeOH Ac₂O Temperature rt rt rt Yield 80% 80% 50% Compound Starting Tetracyclic Tetracyclic Tetracyclic AK material derivative derivative derivative of liphagal of liphagal of with Amine with N- liphagalboronic group at methy acid 10^(th) amine with N- position group at methy 10^(th) amine position group at 10^(th) position Solvent THF THF DCM Temperature rt 0° C. −78° C. to rt Yield 70% 50% Compound Starting Tetracyclic Tetracyclic Tetracyclic AL material derivative derivative derivative of liphagal of liphagal of with Amine with N- liphagalboronic group at dimethy acid 10^(th) amine with N- position group at dimethy 10^(th) amine position group at 10^(th) position Solvent THF THF DCM Temperature rt 0° C. −78° C. to rt Yield 70% 50% Compound Starting Tetracyclic 5,6- 5,6- AM material intermediate Hydroxy,Tetracyclic Hydroxy,Tetracyclic of intermediate intermediate Liphagal of of with liphagal liphagal hydroxy with boronic group at venyloxy acid with 10^(th) group at venyloxy position 10^(th) oxy at 10^(th) position position Solvent THF THF DCM Temperature -rt 0° C. to rt 0° C. Yield 60% 80% 40% Compound Starting Tetracyclic Tetracyclic AN material derivative derivative of liphagal of with liphagalboronic piperidine acid substitution with N- at 10^(th) dimethy position piperidine substation at 10^(th) position Solvent THF DCM Temperature 0° C. −78° C. to rt Yield 70% 50% Compound Starting Tetracyclic Tetracyclic AO material derivative derivative of liphagal of with liphagalboronic Morpholine acid substitution with N- at 10^(th) dimethy position Morpholine substation at 10^(th) position Solvent THF DCM Temperature 0° C. −78° C. to rt Yield 70% 50% Compound Starting Tetracyclic Tetracyclic Tetracyclic AP material derivative derivative derivative of liphagal of liphagal of with Amine with N- liphagalboronic group at dimethy acid 10^(th) amine with N- position group at diethy 10^(th) amine position group at 10^(th) position Solvent THF THF DCM Temperature rt 0° C. −78° C. to rt Yield 70% 50% Compound Starting Tetracyclic Dimethoxy 5,6Dihydroxy AQ material Dimethoxy Liphagal Liphagal liphagal boronic boronic intermediate acid acid intermediate intermediate Solvent THF DCM dioxane Temperature 0-5° C. −78° C. to rt reflux Yield 50% 40% 60% Compound Starting Tetracyclic Tetracyclic 5,6,dihycroy AR material intermediate intermediate Tetracyclic of 1 of intermediate Liphagal Liphagal of boronic boronic Liphagal acid acid boronic intermediate intermediate acid with Keto with intermediate group at Hydroxy with 10^(th) group at Hydroxy position 10^(th) group at position 10^(th) position Solvent MeOH DCM Nitro methane Temperature rt −78° C. to rt 0 to 5° C. Yield 80% 45%0% 45% Compound Starting Dimethoxy 5,6Dihydroxy 5,6Dihydroxy AS material Liphagal Liphagal Liphagal boronic boronic boronic acid acid acid intermediate intermediate intermediate formyl group at 10^(th) position Solvent DCM dioxane MeOH Temperature −78° C. to rt reflux rt Yield 40% 60% 60% Compound Starting Dimethoxy 5,6Dihydroxy 5,6Dihydroxy AT material Liphagal Liphagal Liphagal boronic boronic boronic acid acid acid intermediate intermediate intermediate formyl group at 10^(th) position Solvent DCM dioxane MeOH, NaBH₄ Temperature −78° C. to rt reflux rt Yield 40% 60% 60% Compound Starting Tetracyclic Tetracyclic 5,6- AU material intermediate intermediate Hydroxy,Tetracyclic of of intermediate desmethyl desmethyl of Liphagal Liphagal liphagal boronic boronic boronic acid acid acid with intermediate intermediate Hydroxy with Keto with at 10^(th) group at Hydroxy position 10^(th) group at position 10^(th) position Solvent MeOH THF AC₂O Temperature rt 0° C. to rt 0° C. Yield 80% 80% 50% Compound Starting Tetracyclic Tetracyclic Tetracyclic AV material intermediate intermediate intermediate of 5,6- of 5,6- of 5,6- dimethoxy dimethoxy dimethoxy indole indole indole Derivative Derivative Derivative of Liphagal of of with Liphagal Liphagalboronic Hydroxy with acid with group at cyclopropyl cyclopropyl 10^(th) group group position at 10^(th) at 10^(th) position position Solvent DCM THF DCM Temperature rt 0° C. to rt −78° C. to rt Yield 65% 55% 45% Compound Starting Tetracyclic Tetracyclic Tetracyclic AW material 5,6- 5,6- 5,6- dimethoxybenzo[b]thiophen dimethoxybenzo[b]thiophen dimethoxybenzo[b]thiophen derivative derivative derivative of Liphagal of of with Liphagal Liphagal Hydroxy with boronic group at isopropyl acid with 10^(th) group at isopropyl posistion 10^(th) group at posistion 10^(th) posistion Solvent DCM THF DCM Temperature rt −78° C. to rt −78° C. to rt Yield 65% 55% 45% Compound Starting Tetracyclic Tetracyclic Tetracyclic AX material intermediate intermediate intermediate of 5,6- of 5,6- of 5,6- dimethoxy dimethoxy dimethoxy indole indole indole Derivative Derivative Derivative of Liphagal of of with Liphagal Liphagal Hydroxy with Boronic group at trifluoromethyl acid with 10^(th) group at trifluoromethyl position 10^(th) group at position 10^(th) position Solvent DCM THF DCM Temperature rt −78° C. to rt −78° C. to rt Yield 65% 55% 45% Compound Starting Tetracyclic 5,6- 5,6- AY material intermediate Hydroxy,Tetracyclic Hydroxy,Tetracyclic of intermediate intermediate Liphagal of of with liphagal liphagal hydroxy with boronic group at benzyl acid with 10^(th) group at benzyl at position 10^(th) 10^(th) position position Solvent THF THF DCM Temperature − rt 0° C. to rt 0° C. Yield 60% 80% 40% Compound Starting Tetracyclic Tetracyclic AZ material sixmembered sixmembered derivative derivative of liphagal of Liphagal boronic acid Solvent THF DCM Temperature 0° C. rt Yield 92% 85%

Compound B: ¹H NMR (500 MHz, CDCl₃) δ6.91 (s, 1H), 3.18 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (q, 2H), 1.45 (m, 2H), 1.42 (t, 2H), 1.44 (s, 3H), 1.38 (q, 2H), 1.34 (d, 3H), 1.12 (s, 6H), ppm. Mass: ESI [M+Na]⁺: 531.186; Elemental anal. calcd for C₂₃H₂₇BF₆O₇; C, 54.35; H, 5.31; B, 2.10; F, 22.44. found C, 54.33; H, 5.34; B, 2.11; F, 22.41.

Compound C: ¹H NMR (500 MHz, CDCl₃) δ7.60 (s, 1H), 3.18 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.66 (q, 2H), 1.49 (m, 2H) 1.44 (s, 3H), 1.48 (t, 2H), 1.36 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 499.215; Elemental anal. calcd for C₂₃H₂₇BF₆O₃; C, 58.01; H, 5.31; F, 23.97; B, 2.27. found C, 58.06; H, 5.34; F, 23.99; B, 2.25.

Compound D: ¹H NMR (500 MHz, CDCl₃) δ7.20 (s, 1H), 3.17 (m, 1H), 2.35 (s, 6H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.43 (s, 3H), 1.38 (m, 2H) 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 391.215; Elemental anal. calcd for C₂₃H₃₃BO₃; C, 75.1; H, 9.03; B, 2.94. found C, 75.16; H, 9.06; B, 2.89.

Compound E: ¹H NMR (500 MHz, CDCl₃) δ6.9 (s, 1H), 3.73 (s, 6H), 3.17 (m, 1H), 1.82 (t, 2H), 1.71 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.43 (s, 3H), 1.37 (t, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 423.25; Elemental anal. calcd for C₂₃H₃₃BO₅; C, 69.01; H, 8.32; B, 2.74. found C, 69.05; H, 8.33; B, 2.77.

Compound F: ¹H NMR (500 MHz, CDCl₃) δ7.1 (s, 1H), 3.17 (m, 1H), 2.59 (q, 4H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.24 (t, 6H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 419.29; Elemental anal. calcd for C₂₅H₃₇BO₃; C, 75.75; H, 9.42; B, 2.65. found C, 75.72; H, 9.44; B, 2.66.

Compound G: ¹H NMR (500 MHz, CDCl₃) δ6.9 (s, 1H), 5.90 (s, 2H), 3.17 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.44 (s, 3H), 1.42 (t, 2H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 407.21; Elemental anal. calcd for C₂₂H₂₉BO₅; C, 68.76; H, 7.63; B, 2.85. found C, 68.77; H, 7.65; B, 2.84.

Compound H: ¹H NMR (500 MHz, CDCl₃) δ6.67 (s, 1H), 4.2 (bs, 2H). 3.7 (t, 4H), 3.17 (m, 1H) 2.9 (t, 4H), 1.86 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 463.28 Elemental anal. calcd for C₂₅H₃₇BN2O₄; C, 68.16; H, 8.43; B, 2.44; N, 6.46. found C, 68.16; H, 8.44; B, 2.41.

Compound I: ¹H NMR (500 MHz, CDCl₃) δ6.4 (s, 1H), 4.15 (bs, 4H). 3.17 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 463.28 Elemental anal. calcd for C₂₁H₃₁BN2O₃; C, 68.14; H, 8.44; B, 2.94; N, 7.56. found C, 68.14; H, 8.42; N, 7.55.

Compound J: ¹H NMR (500 MHz, CDCl₃) δ7.8 (s, 1H), 8.01 (bs, 2H), 3.17 (m, 1H), 2.06 (s, 6H), 1.85 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 477.28 Elemental anal. calcd for C₂₅H₃₅BN₂O₅; C, 66.04; H, 7.74; B, 2.38; N, 6.17. found C, 66.02; H, 7.74; B, 2.36; N, 6.16.

Compound K: ¹H NMR (500 MHz, CDCl₃) δ6.4 (s, 1H), 4.02 (bs, 2H), 3.17 (m, 1H), 2.78 (d, 6H), 1.85 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 421.27 Elemental anal. calcd for C₂₃H₃₅BN2O₃; C, 69.50; H, 8.83; B, 2.75; N, 7.05. found C, 69.51; H, 8.82; B, 2.77; N, 7.04.

Compound L: ¹H NMR (500 MHz, CDCl₃) δ7.56 (s, 1H), 8.03 (s, 1H), 5.07 (bs, 1H), 3.17 (m, 1H), 1.85 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 403.23 Elemental anal. calcd for C₂₂H₂₉BN₂O₃; C, 69.47; H, 7.66; B, 2.83; N, 7.35. found C, 69.47; H, 7.65; B, 2.82; N, 7.33.

Compound M: ¹H NMR (500 MHz, CDCl₃) δ6.8 (s, 1H), 5.2 (bs, 2H), 3.17 (m, 1H), 1.85 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 553.16 Elemental anal. calcd for C₂₁H₃₁BN₂O₉S₂; C, 47.55; H, 5.88; B, 2.05; N, 5.24; S, 12.09. found C, 47.54; H, 5.89; B, 2.04; N, 5.24; S, 12.08.

Compound N: ¹H NMR (500 MHz, CDCl₃) δ7.3 (s, 1H), 3.17 (m, 1H), 1.85 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 555.12 Elemental anal. calcd for C₂₁H₂₉BO₁₁S₂; C, 47.45; H, 5.46; B, 2.05; S, 12.09. found C, 47.44; H, 5.45; B, 2.06; S, 12.1.

Compound O: ¹H NMR (500 MHz, CDCl₃) δ6.8 (s, 1H), 3.17 (m, 1H), 1.85 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 658.96 Elemental anal. calcd for C₂₁H₂₇BCl₆O₅Si₂; C, 39.45; H, 4.25; B, 1.66; Si, 8.79; Cl, 33.29. found C, 39.44; H, 4.25; B, 1.68; Si, 8.78; Cl, 33.30.

Compound P: ¹H NMR (500 MHz, CDCl₃) δ6.9 (s, 1H), 5.89 (m, 2H), 5.24 (m, 2H), 5.23 (m, 2H) 4.65 (d, 4H), 3.17 (m, 1H), 1.82 (t, 2H), 1.71 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.43 (s, 3H), 1.37 (t, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 475.27; Elemental anal. calcd for C₂₇H₃₇BO₅; C, 71.69; H, 8.29; B, 2.34. found C, 71.68; H, 8.28; B, 2.33.

Compound Q: ¹H NMR (500 MHz, CDCl₃) δ8.2 (s, 1H), 3.18 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H) 1.44 (s, 3H), 1.48 (t, 2H), 1.36 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 453.19; Elemental anal. calcd for C₂₁H₂₇BN₂O₇; C, 58.69; H, 6.31; N, 6.55; B, 2.57. found C, 58.69; H, 6.33; N, 6.54; B, 2.56.

Compound R: ¹H NMR (500 MHz, CDCl₃) δ8.1 (s, 1H), 3.18 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H) 1.44 (s, 3H), 1.48 (t, 2H), 1.36 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 313.21; Elemental anal. calcd for C₂₃H₂₇BN₂O₃; C, 70.78; H, 6.92; N, 7.18; B, 2.77. found C, 70.77; H, 6.92; N, 7.16; B, 2.78.

Compound S: ¹H NMR (500 MHz, CDCl₃) 67.4 (s, 1H), 3.18 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H) 1.44 (s, 3H), 1.48 (t, 2H), 1.36 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 399.21; Elemental anal. calcd for C₂₁H₂₇BF₂O₃; C, 67.64; H, 7.23; F, 10.12; B, 2.83. found C, 67.65; H, 7.22; F, 10.12; B, 2.84.

Compound T: ¹H NMR (500 MHz, CDCl₃) δ7.2 (s, 1H), 3.18 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H) 1.44 (s, 3H), 1.48 (t, 2H), 1.36 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 431.143; Elemental anal. calcd for C₂₁H₂₇BCl₂O₃; C, 61.64; H, 6.56; Cl, 17.33; B, 2.65. found C, 61.66; H, 6.56; Cl, 17.32; B, 2.64.

Compound U: ¹H NMR (500 MHz, CDCl₃) δ6.59 (s, 1H), 9.1 (s, 2H), 8.03 (s, 1H), 3.18 (m, 1H), 1.78 (t, 1H), 1.75 (t, 2H), 1.64 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 394.226; Elemental anal. calcd for C₂₁H₃₀BNO₄; C, 67.95; H, 8.14; N, 3.77; B, 2.91. found C, 67.98; H, 8.15; N, 3.76; B, 2.91.

Compound V: ¹H NMR (500 MHz, CDCl₃) 6.89 (s, 1H), 9.1 (s, 2H), 8.03 (s, 1H), 2.94 (m, 1H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 401.188 Elemental anal. calcd for C₂₁H₂₉BO₄S; C, 64.95; H, 7.65; S, 8.24; B, 2.73. found C, 64.96; H, 7.66; S, 8.23; B, 2.72.

Compound W: ¹H NMR (500 MHz, CDCl₃) δ6.54 (s, 1H), 9.1 (s, 2H), 3.34 (s, 2H), 2.34 (m, 1H), 1.53 (t, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.43 (t, 1H) 1.41 (m, 2H), 1.38 (m, 2H), 1.26 (s, 3H) 1.17 (d, 3H) 1.12 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 393.236; Elemental anal. calcd. For C₂₂H₃₁BO₄; C, 71.36; H, 8.44; B, 2.92. found C, 71.36; H, 8.43; B, 2.93.

Compound X: ¹H NMR (500 MHz, CDCl₃) δ6.59 (s, 1H), 9.1 (s, 2H), 3.62 (s, 3H), 2.95 (m, 1H), 1.78 (t, 1H), 1.75 (t, 2H), 1.64 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 408.242; Elemental anal. calcd for C₂₂H₃₂BNO₄; C, 68.59; H, 8.34; N, 3.65; B, 2.81. found C, 68.58; H, 8.35; N, 3.65; B, 2.83.

Compound Y: ¹H NMR (500 MHz, CDCl₃) δ6.7 (s, 1H), 3.73 (s, 6H). 3.62 (s, 3H), 2.94 (m, 1H), 1.78 (t, 1H), 1.75 (t, 2H), 1.64 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 436.27; Elemental anal. calcd for C₂₄H₃₆BNO₄; C, 69.73; H, 8.76; N, 3.38; B, 2.64. found C, 69.75; H, 8.77; N, 3.38; B, 2.65.

Compound Z: ¹H NMR (500 MHz, CDCl₃) δ6.9 (s, 1H), 2.98 (m, 1H), 2.21 (m, 1H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H), 1.01 (d, 6H) ppm. Mass: ESI [M+Na]⁺: 423.242; Elemental anal. calcd for C₂₃H₃₃BO₅; C, 69.24; H, 8.31; B, 2.70. found C, 69.26; H, 8.35; B, 2.72.

Compound AA: ¹H NMR (500 MHz, CDCl₃) δ7.3 (s, 1H), 3.18, (m, 1H), 2.08 (s, 6H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.36 (m, 2H), 1.34 (d, 3H) 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 479.236; Elemental anal. calcd for C₂₅H₃₃BO₇; C, 65.76; H, 7.29; B, 2.37. found C, 65.77; H, 7.30; B, 2.38.

Compound AB: ¹H NMR (500 MHz, CDCl₃) δ7.1 (s, 1H), 8.01 (bs, 2H), 10.1 (bs, 1H), 2.94 (m, 1H), 2.06 (s, 6H), 1.85 (t, 2H), 1.78 (t, 1H), 1.61 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 476.28 Elemental anal. calcd for C₂₅H₃₆BN₃O₄; C, 66.24; H, 8.04; B, 2.38; N, 9.17. found C, 66.25; H, 8.02; B, 2.39; N, 9.16.

Compound AC: ¹H NMR (500 MHz, CDCl₃) δ6.66 (s, 1H), 3.17 (m, 1H), 2.83 (s, 12H), 1.82 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.46 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.34 (d, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 449.302 Elemental anal. calcd for C₂₅H₃₉BN₂O₃; C, 70.42; H, 9.22; B, 2.54; N, 6.52. found C, 70.43; H, 9.21; B, 2.55; N, 6.53.

Compound AD: ¹H NMR (500 MHz, CDCl₃) δ6.85 (s, 1H), 9.1 (s, 2H), 2.75 (t, 3H), 1.83 (t, 2H) 1.78 (t, 1H), 1.56 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 395.201; Elemental anal. calcd for C₂₀H₂₅BO₆; C, 64.55; H, 6.83; B, 2.91. found C, 64.54; H, 6.84; B, 2.92.

Compound AE: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 4.33 (t, 1H), 1.89 (m, 2H) 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 465.51; Elemental anal. calcd for C₂₁H₂₆BF₃O₆; C, 57.05; H, 5.91; B, 2.39; F, 12.89. found C, 57.06; H, 5.92; B, 2.40; F, 12.88.

Compound AF: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 3.83 (t, 1H), 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 449.184; Elemental anal. calcd for C₂₁H₂₆BF₃O₅; C, 59.18; H, 6.15; B, 2.59; F, 13.35. found C, 59.16; H, 6.16; B, 2.58; F, 13.35.

Compound AG: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 4.13 (m, 1H), 2.61 (bs, 2H), 1.93 (m, 2H), 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 396.206; Elemental anal. calcd for C₂₀H₂₈BNO₅; C, 64.36; H, 7.56; B, 2.9; N, 3.75. found C, 64.34; H, 7.54; B, 2.89; N, 3.77.

Compound AH: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 4.76 (m, 1H), 3.5 (bs, 1H), 1.87 (m, 2H), 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 397.20; Elemental anal. calcd for C₂₀H₂₇BO₆; C, 64.26; H, 7.26; B, 2.89. found C, 64.25; H, 7.24; B, 2.88.

Compound AI: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 5.43 (m, 1H), 2.25 (s, 3H), 1.93 (m, 2H), 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 439.210; Elemental anal. calcd for C₂₂H₂₉BO₇; C, 63.26; H, 7.02; B, 2.62. found C, 63.26; H, 7.04; B, 2.63.

Compound AJ: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 8.10 (bs, 1H), 5.13 (m, 1H), 2.15 (s, 3H), 1.97 (m, 2H), 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 438.214; Elemental anal. calcd for C₂₂H₃₀BNO₆; C, 63.64; H, 7.28; O, 23.26; B, 2.60; N, 3.35. found C, 63.65; H, 7.30; N, 3.34.

Compound AK: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 4.13 (m, 1H), 3.05 (m, 1H), 2.45 (d, 3H), 1.83 (m, 2H), 1.82 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 410.21; Elemental anal. calcd for C₂₁H₃₀BNO₅; C, 65.15; H, 7.84; B, 2.76; N, 3.96. found C, 65.14; H, 7.85; B, 2.76; N, 3.95.

Compound AL: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 4.13 (m, 1H), 3.05 (m, 1H), 2.25 (d, 6H), 1.82 (t, 2H), 1.80 (m, 2H) 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 424.235; Elemental anal. calcd for C₂₂H₃₂BNO₅; C, 65.85; H, 8.05; B, 2.68; N, 3.49. found C, 65.82; H, 8.02; B, 2.67; N, 3.51.

Compound AM: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 6.47 (d, 1H), 5.03 (t, 1H), 4.18 (dd, 1H), 4.04 (dd, 1H), 2.05 (m, 2H, 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 423.26; Elemental anal. calcd for C₂₂H₂₉BO₆; C, 66.21; H, 7.35; B, 2.69. found C, 66.23; H, 7.36; B, 2.68.

Compound AN: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 4.13 (t, 1H), 2.24 (d, 4H), 1.82 (t, 2H), 1.80 (m, 2H) 1.78 (t, 1H), 1.50 (m, 6H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 464.235; Elemental anal. calcd for C₂₅H₃₆BNO₅; C, 68.05; H, 8.25; B, 2.48; N, 3.19. found C, 68.10; H, 8.22; B, 2.47; N, 3.21.

Compound AO: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 4.13 (t, 1H), 3.65 (t, 4H) 2.34 (d, 4H), 1.82 (t, 2H), 1.80 (m, 2H) 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 466.35; Elemental anal. calcd for C₂₄H₃₄BNO₆; C, 65.08; H, 7.69; B, 2.24; N, 3.17. found C, 65.09; H, 7.71; B, 2.25; N, 3.18.

Compound AP: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 4.13 (t, 1H), 2.4 (q, 4H), 1.82 (t, 2H), 1.80 (m, 2H) 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H), 1.05 (t, 6H) ppm. Mass: ESI [M+Na]⁺: 452.28; Elemental anal. calcd for C₂₄H₃₆BNO₅; C, 67.18; H, 8.49; B, 2.51; N, 3.28. found C, 67.19; H, 8.47; B, 2.53; N, 3.27.

Compound AQ: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.76 (s, 1H), 9.1 (s, 2H) 3.89 (t, 1H), 2.08 (m, 2H) 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 409.34; Elemental anal. calcd for C₂₁H₂₇BO₆; C, 65.37; H, 7.08; B, 2.91. found C, 65.36; H, 7.09; B, 2.92.

Compound AR: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H) 2.93 (m, 1H), 1.83 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H) 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H), 0.59 (m, 1H), 0.34 (m, 4H) ppm. Mass: ESI [M+Na]⁺: 409.34; Elemental anal. calcd for C₂₁H₂₇BO₆; C, 65.37; H, 7.08; B, 2.91. found C, 65.34; H, 7.09; B, 2.92.

Compound AS: ¹H NMR (500 MHz, CDCl₃) δ7.3-7.5 (m, 5H), 6.83 (s, 1H), 6.59 (d, 1H) 9.1 (s, 2H) 2.8 (m, 1H), 1.83 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H) 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 484.23; Elemental anal. calcd for C₂₇H₃₂BNO₅; C, 70.81; H, 6.72; B, 2.31; N, 3.04. found C, 70.84; H, 6.73; B, 2.32; N, 3.06.

Compound AT: ¹H NMR (500 MHz, CDCl₃) δ7.05 (dd, 2H), 6.83 (s, 1H), 6.59 (t, 1H), 6.43 (d, 2H) 9.1 (s, 2H), 3.48 (t, 2H), 3.28 (m, 1H), 1.83 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H) 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 486.253; Elemental anal. calcd for C₂₇H₃₄BNO₅; C, 70.01; H, 7.43; B, 2.32; N, 3.04. found C, 70.06; H, 7.44; B, 2.35; N, 3.06.

Compound AU: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 5.62 (d, 1H), 4.98 (d, 1H), 2.23 (t, 2H), 1.83 (t, 2H), 1.78 (t, 1H), 1.71 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.41 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 393.17; Elemental anal. calcd for C₂₁H₂₇BO₅ C, 68.17; H, 7.38; B, 2.91. found C, 68.16; H, 7.35; B, 2.94.

Compound AV: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 10.05 (bs, 1H), 2.73 (m, 1H), 1.73 (t, 2H), 1.78 (t, 1H), 1.63 (m, 2H) 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H), 0.59 (m, 1H), 0.34 (m, 4H) ppm. Mass: ESI [M+Na]⁺: 420.24; Elemental anal. calcd for C₂₃H₃₂BNO₄; C, 69.57; H, 8.18; B, 2.71; N, 3.56. found C, 69.55; H, 8.13; B, 2.71; N, 3.58.

Compound AW: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 2.74 (m, 1H), 1.73 (t, 2H), 1.78 (t, 1H), 1.63 (m, 2H) 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H), 0.59 (m, 1H), 0.34 (m, 4H) ppm. Mass: ESI [M+Na]⁺: 437.02; Elemental anal. calcd for C₂₃H₃₁BO₄S; C, 66.57; H, 7.58; B, 2.61; S, 7.78. found C, 66.55; H, 7.59; B, 2.62; S, 7.77.

Compound AX: ¹H NMR (500 MHz, CDCl₃) δ6.83 (s, 1H), 9.1 (s, 2H), 10.1 (bs, 1H), 3.53 (t, 1H), 1.83 (t, 2H), 1.78 (t, 1H), 1.64 (m, 2H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 448.194; Elemental anal. calcd for C₂₁H₂₇BF₃O₄N; C, 59.38; H, 6.45; B, 2.59; F, 13.40; N, 3.29. found C, 59.34; H, 6.43; B, 2.58; F, 13.41; N, 3.28.

Compound AY: ¹H NMR (500 MHz, CDCl₃) δ7.95 (d, 2H), 7.47 (t, 1H), 7.37 (dd, 2H), 6.83 (s, 1H), 9.1 (bs, 2H), 5.48 (t, 1H), 2.16 (m, 2H), 1.83 (t, 2H), 1.78 (t, 1H), 1.49 (m, 2H), 1.48 (t, 2H), 1.44 (s, 3H), 1.38 (m, 2H), 1.11 (s, 6H) ppm. Mass: ESI [M+Na]⁺: 501.218; Elemental anal. calcd for C₂₇H₃₁BO₇; C, 67.71; H, 6.59; B, 2.26. found C, 67.74; H, 6.58; B, 2.26.

Compound AZ: For step 1 to 7 Ref: (Pereira A. R.; Strangman, W. K.; Marion, F.; Feldberg, L.; Roll, D.; Mallon, R.; Hollander, I.; Andersen, R. J. J. Med. Chem. 2010, 53, 8523)

Step 1: Synthesis of compound 13 (2-hydroxy-4,5-dimethoxybenzaldehyde): To a solution of 3,4,5-trimethoxybenzaldehyde (5 g, 25.510 mmol) in CH₂Cl₂ (125 ml) at 0° C., BBr₃ (6.39 g, 25.510 mmol) was added. The resulting dark mixture was stirred at rt for 9 h. Water (100 mL) was charged and the mixture was stirred for 10 min, the aqueous phase was extracted by CH₂Cl₂. Organic phase was dried over Na₂SO₄, and evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography using plain dichloromethane as eluent, afforded the 2-hydroxy-4,5-dimethoxybenzaldehyde 13 (4.3 g, 87%) isolated as yellow solid. Mp 105-107° C.; ¹H NMR (CDCl₃, 400 MHz): δ 11.40 (br. s, 1H), 9.70 (s, 1H), 6.91 (s, 1H), 6.48 (s, 1H), 3.94 (s, 3H), 3.88 (s, 3H) ppm. ¹³C NMR (CDCl₃. 125 MHz): 194.0, 159.3, 157.3, 142.9, 113.3, 112.9, 100.1, 56.4, 56.3. HRMS (ESI) m/z: [M+H]⁺ calcd for C9H10O4+H⁺ 183.0657; Found 183.0653.

Step 2: Synthesis of compound 13 (4,5-dimethoxy-2-(methoxymethoxy)benzaldehyde):

A solution of 5 (1 g, 5.49 mmol) in anhydrous CH₂Cl₂ under nitrogen was cooled to 0° C., to it diisopropyl ethylamine (DIPEA) (1.77 g, 13.736 mmol) and MOMCl (0.66 g, 8.241 mmol) were added. The reaction mixture was stirred at room temperature for 1 h. After completion of the reaction, water was added extracted with dichloromethane. The organic extract was washed with brine, dried over anhydrous Na₂SO₄ and evaporated under reduced pressure, the resultant product 14 (2.15 g, 98%) as colorless liquid was used for further reaction without purification. ¹H NMR (CDCl₃, 400 MHz): δ 10.34 (s, 1H), 7.30 (s, 1H), 6.77 (s, 1H), 5.26 (s, 2H), 3.95 (s, 3H), 3.88 (s, 3H), 3.54 (s, 3H) ppm. ¹³C NMR (CDCl₃, 125 MHz): 188.0, 156.4, 155.5, 144.4, 118.1, 108.2, 99.9, 95.4, 56.4, 56.2, 56.1. HRMS (ESI) m/z: [M+H]⁺ calcd for C11H14O5+H⁺ 227.0919; Found 227.0897

Step 3: Synthesis of compound 15 (4,5-dimethoxy-2-(methoxymethoxy)phenyl methanol):

The solution of compound 14 (1 g, 4.423 mmol) and sodium hydroxide (0.177 g, 4.423 mmol) in MeOH was taken in round bottom flask, to it NaBH₄ (0.25 g, 6.635 mmol) was added. The reaction mixture was stirred for half hour at room temperature. The reaction mixture was concentrated under reduced pressure to remove MeOH, added water and was extracted with ethyl acetate, washed with brine, dried over anhydrous Na₂SO₄ and evaporated under reduced pressure afforded colorless liquid 15 (0.99 g, 98%), the resultant product was used for further reaction without purification. ¹H NMR (200 MHz, CDCl₃): δ 6.86 (s, 1H), 6.75 (s, 1H), 5.16 (s, 2H), 4.65-4.62 (d, J=5.29 Hz, 2H), 3.87 (s, 3H), 3.86 (s, 3H), 3.52 (s, 3H) ppm. ¹³C NMR (CDCl₃, 100 MHz): 149.15, 149.0, 144.1, 122.1, 112.56, 101.3, 96.0, 60.7, 56.3, 56.1, 55.9. HRMS (ESI) m/z: [M+Na]⁺ calcd for C11H16O5+Na⁺ 251.0896; Found 251.0874

Step 4: Synthesis of compound 16 (2-hydroxy-4,5-dimethoxybenzyl)triphenylphosphonium hydrogen bromide salt): A solution of compound 15 (1 g, 4.384 mmol) in acetonitrile was taken, to this PPh₃HBr (1.8 g, 5.260 mmol) was added at room temperature and refluxed for about 2 h. After completion of the reaction solvent was removed under reduced pressure and washed with ether, gave compound 16 (1.69 g, 90%) as a white amorphous solid. Mp 240-242° C.; ¹H NMR (CDCl₃, 400 MHz): δ 8.62 (br. s, 1H), 7.75-7.71 (m, 3H), 7.60-7.52 (m, 12H), 7.03 (s, 1H), 6.44-6.43 (d, J=12.8 Hz, 1H), 4.48-4.45 (d, J=12 Hz, 2H), 3.69 (s, 3H), 3.48 (s, 3H) ppm. ¹³CNMR (CDCl₃, 125 MHz): 134.7, 134.7, 134.3, 130.0, 129.9, 113.9, 113.90, 101.9, 101.9, 56.3, 55.9, 25.3, 24.8. HRMS (ESI) m/z: [M]⁺ calcd for C27H26O3P 429.1620 (—HBr); Found 429.1615 (—HBr).

Step 5: Synthesis of compound 18 a starting material 3-(2,6,6-trimethylcyclohex-1-enyl)propanoic acid: 17 g (425.001 mmol) of NaOH was dissolved in water to make a 70 ml solution in a 250 ml conical flask with a magnetic stirrer. The alkali solution was then cooled in an ice bath and 17 g (106.25 mmol) of bromine was added to the solution after stirring for 1 h, 4.5 g (23.19 mmol) of dihydro-β-ionone 17 in 10 ml of dioxane was dropped into the solution, the stirring was continued at rt for 4 h. The excess of hypobromite was neutralized with 10% sodium bisulfite and solution was extracted with diethylether to remove remaining impurities. Acidification of the alkaline solution with conc. hydrochloric acid was done under usual conditions and workup gave 18 (4.1 g, 90.1%) as a colorless liquid. ¹H NMR (CDCl₃, 400 MHz): δ 2.44-2.39 (m, 2H), 2.37-2.31 (m, 2H), 1.93-1.89 (t, J=8 Hz, 2H), 1.61 (s, 3H), 1.58-1.54 (s, 2H), 1.44-1.41 (m, 2H), 1.00 (s, 6H). ¹³CNMR (CDCl₃, 100 MHz): 180.3, 135.4, 128.5, 39.7, 34.9, 34.7 (multiple merged peaks), 28.4, 23.5, 19.6, 19.4. HRMS (ESI) m/z: [M+H]⁺ calcd for C12H20O2+H⁺ 197.1541; Found 197.1530.

Step 6: Synthesis of compound 19 (5,6-dimethoxy-2-(2-(2,6,6-trimethylcyclohex-1-enyl)ethyl)benzofuran): The intermediate 16 (2 g, 4.651 mmol) was taken in dry DCM along with dihydro-β-ionicacid 18 (0.91 g, 4.65 mmol) in round bottom flask, in dry conditions and cooled to 0° C. To it DCC (2.87 g, 13.953 mmol) and DMAP (0.56 g, 4.651 mmol) were added and stirred at room temperature for 18 h. DCM was evaporated under reduced pressure and the crude reaction mixture was dissolved in THF and to it was added triethylamine and refluxed for 3 h. THF was evaporated under reduced pressure and purified by column chromatography 5% ethyl acetate: hexane afforded 19 (1.42 g, 93%) as colorless oil. ¹H NMR (400 MHz, CDCl₃): δ 6.93 (s, 1H), 6.85 (s, 1H), 6.20 (d, J=0.6 Hz, 1H), 3.81 (d, 6H), 2.70-2.66 (m, 2H), 2.34-2.30 (m, 2H), 1.87-1.85 (t, J=6.1 Hz, 2H), 1.58 (s, 3H), 1.54-1.44 (m, 2H), 1.51-1.49 (m, 2H), 0.96 (s, 6H). ¹³CNMR (CDCl₃, 100 MHz): 158.8, 149.1, 146.9, 146.1, 136.2, 128.1, 102.7, 101.0, 95.3, 56.4, 56.2, 39.7 (multiple merged peaks), 35.0, 32.7, 29.3, 28.5, 27.2, 19.8, 19.4 (merged peaks). HRMS (ESI) m/z: [M+H]⁺ calcd for C21H28O3+H⁺ 329.2117; Found 329.2099.

Step 7: Synthesis of compound 20: The solution of compound 19 (1 g, 3.049 mmol) was prepared in 2-nitro propane and cooled to 78° C., to it chlorosulfonic acid (1.06 g, 9.146 mmol) was added under inert atmosphere. The reaction mixture was stirred for 30 min. Then quenched with NaHCO₃ and extracted by ethyl acetate. The organic layer was dried over Na₂SO₄ and evaporated under reduced pressure and purified by column chromatography using 5% ethyl acetate:hexane afforded 20 (0.9 g, 90% yield) as colorless oil. ¹H NMR (400 MHz, CDCl₃): δ 7.00 (s, 1H), 6.97 (s, 1H), 3.91 (s, 3H), 3.89 (s, 3H), 2.79-2.74 (m, 1H), 2.72-2.65 (m, 1H), 2.42 (d, J=13.0 Hz, 1H), 2.06-1.91 (m, 2H), 1.87-1.76 (m, 2H), 1.50-1.63 (m, 2H), 1.45-1.39 (m, 2H), 1.31 (s, 3H), 0.97 (s, 3H), 0.95 (s, 3H). ¹³CNMR (CDCl₃, 125 MHz): 151.2, 149.2, 146.4, 145.4, 124.3, 118.8, 102.4, 95.5, 56.6, 56.2, 52.6, 41.8, 37.6, 35.9, 33.5, 33.1, 24.9, 21.8, 21.3 (merged peaks), 18.8. HRMS (ESI) m/z: [M+H]⁺ calcd for C21H28O3+H⁺ 329.2117; Found 329.2105, [M+Na]⁺ calcd for C21H28O3+Na⁺ 351.1936; Found 351.1931

Step 8: Synthesis of compound 21: The solution of compound 20 (1 g, 3.048 mmol) was prepared in dry THF, and cooled to 0° C. under dry condition. To it n-BuLi (0.195 g, 3.048 mmol) was added and the reaction mixture was kept for 20 minutes stirring, to it triethyl borate (0.45 g, 3.048 mmol) was added and continued stirring for another 1 h at rt. Quenched with ammonium chloride solution and extracted by ethyl acetate. Concentrated under reduced pressure and purified by column chromatography using 6% ethyl acetate: hexane afforded 21 (1.043 g, 92%) as a colorless liquid. ¹H NMR (400 MHz, CDCl₃) δ 7.18 (s, 1H), 6.83 (s, 2H), 3.96 (s, 3H), 3.93 (s, 3H), 2.80-2.73 (m, 2H), 2.42 (d, J=12.0 Hz, 1H), 2.03 (m, 2H, merged signals), 1.89-1.76 (m, 2H), 1.73-1.66 (m, 2H), 1.45-1.40 (m, 2H), 1.32 (s, 3H), 0.99 (s, 3H), 0.96 (s, 3H). ¹³C NMR (CDCl₃, 100 MHz) 153.0, 152.9, 151.0, 148.4, 124.3, 122.4, 107.1, 61.9, 56.7, 52.7, 41.8, 36.1, 33.5, 33.2 (merged peaks), 25.1, 21.9, 21.4, 18.9, 18.8. HRMS (ESI) m/z: [M+H]⁺ calcd for C₂₁H₂₉BO₅+H⁺ 372.2217; Found 372.2231.

Step 9: Synthesis of compound 22: To (0.5 g, 4.301 mmol) of dry aluminium chloride, 5 ml of dichloromethane was poured, then (0.245 g, 3.225 mmol) of crystalline thiourea was added in small portions and stirred for 20 minutes. The reaction mixture becomes transparent oily solution. Then compound 21 (0.1 g, 0.268 mmol) dissolved in dichloromethane was added to this over a period of 5 minutes and stirred for 2 h at rt. The excess of AlCl₃ was removed by quenching with ice and extracted by dichloromethane and then purified by column chromatography using 15% ethylacetate: hexane afforded 22 (0.077 g, 85% yield) as colorless liquid. ¹H NMR (500 MHz, CDCl₃): δ 7.10 (s, 1H), 6.74 (s, 1H), 6.48 (br.s, 1H), 3.94 (s, 2H), 2.80-2.71 (m, 2H), 2.39 (d, J=10 Hz, 1H), 2.20-2.03 (m, 2H), 1.80-1.70 (m, 2H), 1.54-1.51 (m, 2H), 1.44-1.37 (m, 2H), 1.30 (s, 3H), 0.98 (s, 3H), 0.95 (s, 3H). ¹³C NMR (CDCl₃, 125 MHz): 153.4, 151.1, 147.9, 142.9, 124.3, 118.1, 114.1, 105.1, 52.6, 41.8, 37.7, 36.0, 33.5, 29.5, 25.0, 21.9, 21.4, 18.9, 18.8; HRMS (ESI) m/z: [M⁺]: calcd for C₁₉H₂₅BO₅ 344.1795; Found 344.1761.

Biology:

1. Cytotoxic Assay

The MTT assay (MTT Assay (Legrier M E, Yang C P, Yan H G et al. Targeting protein translation in human non small lung cancer via combined MEK and mammalian target of rapamycin suppression. Cancer Res 67:11300-8(2007).) is useful for measuring the effect of a wide range of compounds on the in vitro growth of either normal or cancer cell lines. The assay was set up in a 96-well, flat-bottomed polystyrene microtiter plate. 3-5000 cells were suspended per well in appropriate growth medium, and the cells were added to replicate wells (triplicates were preferred). It was preferable to add the cells to the required number of wells in the plate prior to adding the drugs or the test agents. After the cells were added to the plate, it was placed on the incubator for overnight incubation, while the agents to be tested were being prepared. After overnight incubation drugs or test compounds were added at defined concentrations to each set of replicate wells and incubated for 48 hrs in CO₂ incubator. Most of these compounds were dissolved in dimethyl sulfoxide (DMSO) for the final addition. After 48 hr incubation, diluted the MTT stock solution (2.5 μg/ml) with an equal volume of tissue culture medium and added 20 μl of this solution directly to each well with a multichannel pipette. As with the adherent-cell method, return the plates to the incubator for a period of at least 4 h. After 4 hr incubation centrifuge the plates at 1000 g for 10 min at ambient temperature, followed by inversion of the plates and blotting of excess medium. Add 150 μl of working DMSO to solubilize the MTT formazan product. A standard micro plate reader with adjustable wavelength across the visible spectrum was used. The OD values at 570 nm obtained for each set of triplicates corresponding to a specific concentration of a test agent was then transferred into a spreadsheet program. Results: Cytotoxicity assay based on MTT was performed on the panel of cancer cell lines using compound A and compound E as a test material. In order to determine the effect of compound A and compound E on cell proliferation and in relative IC₅₀ values, MCF-7, caco-2 & HCT-115 were treated with compound A and compound E at indicated concentrations (0.01, 0.1, 1, 10 μM) for 48 h. In the present study, compound A and compound E produced concentration dependent inhibition of cell proliferation. From the MTT based inhibition in cell proliferation, the calculated cell based IC₅₀ value of 2.6 μM and 2.4 μM in breast (MCF-7) and colon (caco-2) cell line were observed for compound A and 5.6, 3.7 and 3.1 μM in colon (caco-2, HCT-115) and breast (MCF-7) for compound E was calculated (FIG. 3). These results depicted that both compound A and compound E showed more effectiveness against colon cell proliferation as reflected by relative IC₅₀ values and therefore towards the colon cancer in general.

2. PI3K Inhibition Assays:

PI3K inhibition assay (PI3K Assay (Emmanuelle M, Huang Y, Yan H G et al. Targeting Protein Translation in Human Non-Small Cell Lung Cancer via Combined MEK and Mammalian Target of Rapamycin Suppression. Cancer Res 67:(23). (2007).) was carried out by PI3 Kinase activity/inhibitor assay kit, where PI3 kinase reaction was set up in Glutathione-coated strips/plate for inhibitor reaction. Kinase and inhibitors were pre-incubated for 10 minutes prior to the addition of PIP2 substrate. 5 μL of 5× kinase reaction buffer were added in each well followed by the further addition of 5 μL/well of PIP2 substrate. Then distilled H₂O was added to each well so as to make up a final volume of 25 μL/well. Incubation was done at rt for 1 hour which was followed by washing the wells 3 times with 200 μL of 1×TBST per well and then 2 times with 200 μL of IX TBS per well. Then 100 μL of the Substrate TMB per well was added and then to keep for colour development in the dark for 5-20 minutes. However, appearance of the blue color to avoid over-development were monitored. 100 μL of the stop solution per well was used to stop the reaction. Readings were recorded at 450 nm.

Results:

The IC₅₀ value of a drug measures the effectiveness of a compound in inhibiting biological or biochemical function. Drug molecules can be categorized as low, active or highly active based on IC₅₀ values. The determination of enzyme based IC₅₀ values helps in early analysis and estimation of the drug activities in order to narrow down drug candidates for further experimental purpose. The liphagal, compound A and compound E used in the present study inhibited PI3Kα enzyme activity in dose dependent pattern with varying concentration i.e 20, 40, 80, 160, 320 and 640 nM respectively. Moreover, an IC₅₀ of 108, 140 and 102 nM for liphagal, compound A and compound E against PI3Kα was observed and 100 nM for compound A against PI3Kβ was also determined (FIGS. 4 and 5). This approach will not only enhance origin specific cancer drug discovery process, but will also save time and resources committed.

TABLE 2 Showing IC₅₀ values of PI3K isoforms for compound-AZ Compound PI3K (IC₅₀) AZ α β γ δ 23 nM 5.7 μM 85.39 μM 303 μM

3. Cell Cycle Analysis:

Analysis (Cell cycle (Waxman D J, Schwartz P S, Harnessing apoptosis for improved anti-cancer gene therapy, Cancer Res. 63:8563-8572(2003).) of a population of cells replication state can be achieved by fluorescence labeling of the nuclei of cells in suspension and then analyzing the fluorescence properties of each cell in the population. The experiment was performed using caco-2, colon human cancer cell line. Cells were seeded in 6 well plates at the concentration of 3×10⁵ cells/ml/well. Plate was incubated in CO₂ incubator for overnight. After overnight incubation test sample(s) were added at desired concentration, sparing wells for negative and positive control and incubated for 24 hrs. After 24 hr incubation, cell were trypsinized along with test sample from each well was extracted using a micropippete and separately transferred into 15 ml centrifuge tubes. Tubes were centrifuged at 3000 rpm for 5 min. The supernatant was discarded and pellet was resuspended in 1 ml filtered PBS and centrifuged at 2000 rpm for 5 min. After 5 mins supernatant was discarded and pellet was resuspended in 70% ethanol. Cells were fixed for at least 1 hour at 4° C. (cells may be stored in 70% ethanol at −20° C. for several weeks prior to PI staining and flow cytometric analysis). Cells were again centrifuged at 2000 rpm for 5 minutes and washed twice in filtered PBS by centrifuging at 2000 rpm for 5 min. Supernatant was discarded and tubes were placed in inverted position over tissue paper till all the supernatant drained over the paper. 1 ml of cell cycle reagent (CCR) was added in each acquisition tube in dark. Reading was taken on flow cytometer (BD Biosciences).

Results: Cell cycle is the life cycle of a cell. Each stage of the cell cycle i,e. G1 (Gap1), S, G2 (Gap 2), & M (mitosis) have unique events that occur within each of them. Two of the most popular flow cytometric applications are the measurement of cellular DNA content and the analysis of the cell cycle which are fundamental processes of cell survival. In the present study, the effect of compound E on the DNA content by cell cycle phase distribution was assessed by using colon (caco-2) cell line. In addition to determining the relative cellular DNA content, flow cytometry also enables the identification of the cell distribution during the various phases of the cell cycle. Cells (2×10⁶/ml/6-well plate), exposed to different concentrations of compound E were stained with propidium iodide (PI) to determine DNA fluorescence and cell cycle phase distribution. The percentage of compound E treated sub-G0 cells with 1, 5, 7 and 9 μM for 24 h was found to be 62.5%, 64.3%, 65.6% and 70.2% respectively. Under similar conditions, Liphagal treated cultures showed 64.9% cells in sub-G0 phase. Further, the cell cycle at G2/M phase was not affected indicating that compound E treatments does not produce any mitotic block or cause delay in cell cycle. Overall, each treatment with an increase in concentration led to an increase in sub-G0 after 24 h treatment. Thus, it is clear that compound E induced early cell cycle arrest with concentration dependent manner (FIG. 6).

4. Annexin-V Apoptotic Assay:

The cell death status was analysed using Annexin-V (Annexin-V apoptotic assay (Yunqing Li, FadilaGuessous, SherwinKwon, Manish Kumar. PTEN Has Tumor-Promoting Properties in the Setting of Gain-of-Function p53 Mutations, 2008 Cancer Res; 68: (6) (2008).) Flow cytometery. The experiment was performed using caco-2 colon human cancer cell line. Cells were seeded in 6 well plates at the concentration of 2×10⁵ cells/ml/well. Plates were incubated in CO₂ incubator for overnight. After overnight incubation test sample(s) were added at desired concentration, sparing wells for negative and positive control and incubated for 48 hrs. After 48 hr incubation, cell were trypsinized and separately transferred into 15 ml centrifuge tubes. Tubes were centrifuged at 3000 rpm for 5 min. The supernatant was discarded and pellet was resuspended in 1 ml filtered PBS and centrifuged at 2000 rpm for 5 min. After 5 mins supernatant was discarded and pellet was resuspended in 400 ml of 1× binding buffer to make cell suspension. From this suspension, 100 μl of cells is transferred in falcon tube and then 10 μl of propidium iodide (PI) and 5 μl Annexin-V antibody were added and incubated for 30 min in dark. After 30 min incubation in dark, apoptosis were analysed by flow cytometer (BD Biosciences).

Results: In the present study, the percentage of compound E treated late apoptotic cells with 1, 5, 7 and 9 μM for 48 h was found to be 36.3%, 34.8%, 38.5% and 56.8% respectively. Under similar conditions, Liphagal treated cultures showed 42.7% cells late apoptotic phase and reverse was found in early apoptotic phase with cell population decreasing 21.9%/o, 23.4%, 21.4% and 14.7% in early apoptotic phase. Further, there were not so much population of cell in necrotic phase indicating that compound E, treatments does not produce any early apoptosis and necrosis. Overall, there was a concentration dependent net increase in late apoptotic cell population (FIG. 7).

Materials & Methods:

For immunofluorescence microscopic analysis, 4×104 CACO-2 cells/ml were seeded on 18-mm coverslips in 6-well plates, one day before experiment. Cells were serum starved overnight and treated with liphagal and compound E, 4 and 3 μM respectively for 24 hr. Following treatment, cells were washed in PBS, followed by fixation in absolute methanol at −20° C. for 5 min¹⁹. The fixed cells were blocked with 10% goat serum in PBS for 20 min at room temperature to eliminate non-specific binding of secondary antibody. Cells were incubated with polyclonal rabbit pAKT (serine 473) primary antibody (1:100 in 0.5% BSA in PBS; Santa Cruz Biotechnology) for 1 h at 25° C. in moist chamber, then washed and incubated with secondary antibody. The cells were washed and incubated for 45 min with a Texas red-conjugated goat antirabbit antibody (1:500 in 0.5% BSA in PBS; Santa Cruz Biotechnology) at 25° C. The coverslips were mounted on glass slides with 4′,6-diamidino-2-phenylindole-containing ProLong Gold Antifade mounting medium (Invitrogen) and visualized by fluorescence microscope (Olympus, IX81) under an Olympus 60× oil immersion objective lens. The negative controls were also used in which incubation of cells with primary antibody was omitted.

Results: Phosphorylation (activation) of Akt is associated with protection of cells from apoptosis²⁰ (K. Nicholson, N. Anderson. 2002. The protein kinase B/Akt signaling pathway in human malignancy. Cell signal 14: 381-395). In the present studies it was observed that treatment of CACO-2 cells with liphagal and compound E, 4 and 3 M respectively for 24 hr caused the inhibition of pAkt (Ser 473). The inhibition of Akt consequently leads to apoptosis. The untreated cells showed the pAKT in the cytoplasm (FIG. 8).

Advantages of the Present Invention

Advantages of introducing boronic acid functionality: Recent report on synthetic analog of liphagal (Alban R. Pereira, Wendy K. Strangman, Synthesis of phosphatidylinositol 3-kinase (PI3K) inhibitory analogues of the sponge meroterpenoid Liphagal; J. Med. Chem., 2010, 53 (24), pp 8523-8533) with an IC50 of 66 nM and selectivity towards PI3K-α, suggests that this analog possess greater chemical structure stability and gives opportunity for developing this skeleton into lead preclinical candidate. As a part of our ongoing program on developing isoform selective PI3K inhibitors, it occurred to us that it would be interesting to embark a program on the preparation of compounds based on this modified structure, leveraging the evidence of biological activity exhibited by this molecule. In this direction, we initiated our efforts, and planed to replace aldehyde functionality with boronic acid. Further, the 14-formyl-15,16-dihydroxy substitution pattern in the aromatic ring of liphagal is required to achieve nanomolar potency. It is also demonstrated that the absence of the C-14 formyl group appears to destabilize the liphagane heterocyclic ring system, making it more susceptible to air oxidation and skeletal rearrangements involving ring B contraction. This evidence suggests that the C-8 desmethyl analog with contracted B ring to six-membered, must be ultimately responsible for the activity, which supports our envision. Therefore, instead of formyl at the C-14, we designed a contracted B ring analog without formyl functionality having boronic acid in this place, assuming that this analog would offer more rigidity to the structure. Also, using a boronic acid instead of an aldehyde could circumvent the associated drawbacks. Moreover, boron has ability to biomimic carbon and forms the covalent adducts with the serine or histidine residues of the active site ((a) Adams, J. A.; Behnke, M.; Chen, S.; Cruichshank, A. A.; Dick, L. R.; Grenier, L.; Klunder, J. M.; Ma, Y. T.; Plamondon, L.; Stein, R. L. Bioorg. Med. Chem. Lett. 1998, 98, 333. (b) Paramore, A.; Frantz, S. Nat. Rev. Drug Discovery 2003, 2, 611).

Keeping in view the role of boron, the importance of boronic acid bearing compounds of liphagal are visualized as potential PI3K inhibitor. The evidence from the computational in silico docking of this boronic acid bearing liphagal compounds PI3K showed excellent H-bonding interactions with key amino acids, which are also previously reported as a key amino acid to be involved in inhibitory interactions in the p110α active site of PI3K-α with improved docking score of −8.08 over 1 and 2.12 The biological potential of boronic acid as PI3K inhibitor was also examined, which has shown PI3K-α isoform selectivity and excellent inhibitory activity (IC₅₀ 23 nM) for one of the compound i.e. compound-AZ. 

We claim:
 1. A compound of general formula 1, and pharmaceutically acceptable salts thereof,

wherein, a) ‘Y’=O, S, NH or NR, wherein R=alkyl moiety, aryl moiety, heteroaryl moiety cyclic aliphatic ring or aromatic system; b) wherein n=0 or 1; ciii) wherein R₁, R₂ and R₃ are independently selected from a group consisting of H, OH, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″, OCF₃, CF₃ and R, wherein, R, R′, R″ are independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclic aliphatic ring, wherein the cyclic aliphatic ring is selected from a group consisting of cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl ring and wherein the cyclic aliphatic ring has different substitutions at different positions, wherein the alkyl moiety is selected from a group consisting of methyl, ethyl, propyl, isopropyl, butyl and isobutyl, and wherein aryl or heteroaryl moiety has substitutions selected from a group consisting of halo, alkyl with different chain length, nitro, amino, and sulphonyl substitutions; diii) wherein R₄=H or OR or SR or SO₂R or OSO₃R or SiRR′R″ or NH₂ or NHR or NRR′ or an alkyl substituent or one to ten carbon chain either linear or branched, saturated or unsaturated alkyl group optionally substituted with OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R′, CN, SiRR′R″ or R, wherein R, R′, R″ are independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclicaliphatic ring with different substitutions with varying chain length cyclicaliphatic ring with different substitutions and varying chain length, wherein the alkyl moiety is selected from a group consisting of methyl, ethyl, propyl, isopropyl, butyl isobutyl, and wherein aryl or heteroaryl moiety has substitutions selected from a group consisting of halo, alkyl with different chain length, nitro, amino, and sulphonyl substitutions; wherein the alkyl substituent is selected from a group consisting of methyl, ethyl, propyl and higher homologues, wherein the higher homologues are linear, branched or alicyclic substituents, wherein the alicyclic substituents are selected from a group consisting of cyclopentane, cyclohexane, higher membered rings, fused rings and aryl/heteroaryl substituted alkyl groups, wherein the aryl/heteroaryl substituted alkyl groups are benzylic or unsaturated alkyl groups further selected from a group consisting of cinnamul, crotyl and prenyl substituents; e) wherein R₅, R₆ and R₇ are independently selected from a group consisting of H, one to ten carbon chain either linear or branched, saturated or unsaturated at any position, and alkyl group, wherein the alkyl group is optionally substituted with OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR′, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiR′R′R″ and R, wherein R, R′, R″ independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclicaliphatic ring with different substitutions.
 2. The compound as claimed in claim 1, wherein the compound of general formula 1 is represented by compounds of formula A, B, C, D, E, F, C, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, AA, AB, AC, AD, AE, AF, AG, AH, AI, AJ, AK, AL, AM, AN, AO, AP, AQ, AR, AS, AT, AU, AV, AW, AX, AY and AZ comprising the following structural formula:


3. The compound as claimed in claim 1, useful as specific inhibitor of PI3K-α or β isoform in cancer treatment.
 4. A process for preparation of compounds of general formula 1 and pharmaceutically acceptable salts thereof

wherein, a) ‘Y’=O, S, NH or NR, wherein R=alkyl moiety, aryl moiety, heteroaryl moiety cyclic aliphatic ring or aromatic system; b) wherein n=0 or 1; civ) wherein R₁, R₂ and R₃ are independently selected from a group consisting of H, OH, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″, OCF₃, CF₃ and R, wherein, R, R′, R″ are independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclic aliphatic ring, wherein the cyclic aliphatic ring is selected from a group consisting of cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl ring and wherein the cyclic aliphatic ring has different substitutions at different positions, wherein the alkyl moiety is selected from a group consisting of methyl, ethyl, propyl, isopropyl, butyl and isobutyl, and wherein aryl or heteroaryl moiety has substitutions selected from a group consisting of halo, alkyl with different chain length, nitro, amino, and sulphonyl substitutions; div) wherein R₄=H or OR or SR or SO₂R or OSO₃R or SiRR′R″ or NH₂ or NHR or NRR′ or an alkyl substituent or one to ten carbon chain either linear or branched, saturated or unsaturated alkyl group optionally substituted with OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R′, CN, SiRR′R″ or R, wherein R, R′, R″ are independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclicaliphatic ring with different substitutions with varying chain length cyclicaliphatic ring with different substitutions and varying chain length, wherein the alkyl moiety is selected from a group consisting of methyl, ethyl, propyl, isopropyl, butyl isobutyl, and wherein aryl or heteroaryl moiety has substitutions selected from a group consisting of halo, alkyl with different chain length, nitro, amino, and sulphonyl substitutions; wherein the alkyl substituent is selected from a group consisting of methyl, ethyl, propyl and higher homologues, wherein the higher homologues are linear, branched or alicyclic substituents, wherein the alicyclic substituents are selected from a group consisting of cyclopentane, cyclohexane, higher membered rings, fused rings and aryl/heteroaryl substituted alkyl groups, wherein the aryl/heteroaryl substituted alkyl groups are benzylic or unsaturated alkyl groups further selected from a group consisting of cinnamul, crotyl and prenyl substituents; e) wherein R₅, R₆ and R₇ are independently selected from a group consisting of H, one to ten carbon chain either linear or branched, saturated or unsaturated at any position, and alkyl group, wherein the alkyl group is optionally substituted with OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR′, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiR′R′R″ and R, wherein R, R′, R″ independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclicaliphatic ring with different substitutions. wherein the process comprises the following steps: iv) reacting compound 9 with n-butyl lithium or potassium-tert-butoxide in an ether solvent in presence of a base;

v) adding triethyl or trimethyl borate to the above mixture obtained in step (i) and stirring; vi) quenching the reaction of step (ii) with saturated ammonium chloride solution followed by extraction with water immiscible solvent to obtain compound of general formula 10

iv) reacting the compound 10 with BI₃ or DMS or AlCl₃/thiourea in a proportion in the range of 1:1 to 3:4 by moles in an ether solvent; v) quenching the reaction of step (iv) by addition of hypo solution followed by extraction with a water immiscible solvent to obtain compound of general formula
 1. 5. The process as claimed in claim 4, wherein the ether solvent used in step (i) and (v) is selected from a group consisting of tetrahydrofuran, dichloromethane, diethyl ether, diisopropyl ether and isopropyl ether.
 6. The process as claimed in claim 4, wherein the base in step (i) is selected from a group consisting of tetramethyl ethylene diamine, triethyl amine, trimethyl amine and diisopropyl ethyl amine.
 7. The process as claimed in claim 4, wherein reaction in step (i) is carried out at a temperature in the range of −78° C. to 35° C. for a period ranging between 5 to 10 min.
 8. The process as claimed in claim 4, wherein reaction in step (ii) is carried out at a temperature in the range of 0-5° C., for a period ranging between 1 to 2 h.
 9. The process as claimed in claim 4, wherein the water immiscible solvent in step (iii) and (v) is selected from a group consisting of ethylacetate, dichloromethane, ether or chloroform.
 10. The process as claimed in claim 4, wherein reaction in step (iv) is carried out at a temperature ranging between −78° C. to 35° C. for a period ranging between 1 to 3 h,
 11. The process as claimed in claim 4, wherein the compound of general formula 1 obtained in step (v) is converted into a pharmaceutically acceptable salt.
 12. The process as claimed in claim 11, wherein the compound of general formula 1 is converted into a pharmaceutically acceptable salt by a process comprising the steps of mixing the compound of general formula 1 with a base in a ratio 1:1 proportion, wherein the base is selected from a group consisting of sodium hydroxide, potassium hydroxide and ammonium hydroxide in water, stirring the reaction mixture for 1-2 h followed by drying to obtain the pharmaceutically acceptable salt of the compound of general formula
 1. 13. A pharmaceutical composition comprising the compound of formula 1, optionally along with a pharmaceutically acceptable carrier, salt, excipients or diluents.
 14. The pharmaceutical composition as claimed in claim 13, wherein the pharmaceutically acceptable carrier is selected from a group consisting of water, buffered saline, glycols, glycerols, olive oil and liposomes.
 15. A method of treatment of cancer by specific inhibition of PI3K-α or β isoform in a human cancer cell line using a compound of general formula 1,

wherein, a) ‘Y’=O, S, NH or NR, wherein R=alkyl moiety, aryl moiety, heteroaryl moiety cyclic aliphatic ring or aromatic system; b) wherein n=0 or 1; cv) wherein R₁, R₂ and R₃ are independently selected from a group consisting of H, OH, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiRR′R″, OCF₃, CF₃ and R, wherein, R, R′, R″ are independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclic aliphatic ring, wherein the cyclic aliphatic ring is selected from a group consisting of cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl ring and wherein the cyclic aliphatic ring has different substitutions at different positions, wherein the alkyl moiety is selected from a group consisting of methyl, ethyl, propyl, isopropyl, butyl and isobutyl, and wherein aryl or heteroaryl moiety has substitutions selected from a group consisting of halo, alkyl with different chain length, nitro, amino, and sulphonyl substitutions; dv) wherein R₄=H or OR or SR or SO₂R or OSO₃R or SiRR′R″ or NH₂ or NHR or NRR′ or an alkyl substituent or one to ten carbon chain either linear or branched, saturated or unsaturated alkyl group optionally substituted with OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R′, CN, SiRR′R″ or R, wherein R, R′, R″ are independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclicaliphatic ring with different substitutions with varying chain length cyclicaliphatic ring with different substitutions and varying chain length, wherein the alkyl moiety is selected from a group consisting of methyl, ethyl, propyl, isopropyl, butyl isobutyl, and wherein aryl or heteroaryl moiety has substitutions selected from a group consisting of halo, alkyl with different chain length, nitro, amino, and sulphonyl substitutions; wherein the alkyl substituent is selected from a group consisting of methyl, ethyl, propyl and higher homologues, wherein the higher homologues are linear, branched or alicyclic substituents, wherein the alicyclic substituents are selected from a group consisting of cyclopentane, cyclohexane, higher membered rings, fused rings and aryl/heteroaryl substituted alkyl groups, wherein the aryl/heteroaryl substituted alkyl groups are benzylic or unsaturated alkyl groups further selected from a group consisting of cinnamul, crotyl and prenyl substituents; e) wherein R₅, R₆ and R₇ are independently selected from a group consisting of H, one to ten carbon chain either linear or branched, saturated or unsaturated at any position, and alkyl group, wherein the alkyl group is optionally substituted with OH, H, ═O, ═S, OR, COR, CHO, CO₂R, OCOR, NH₂, NHR′, NRR′, NO₂, F, Cl, Br, I, OSO₃H, SO₂R, CN, SiR′R′R″ and R, wherein R, R′, R″ independently selected from a group consisting of alkyl moiety, aryl moiety, heteroaryl moiety and cyclicaliphatic ring with different substitutions. wherein the method comprises: mixing the compound of general formula 1 and a human cancer cell line selected from a group consisting of a lung cell line (A549), a leukemia cell line (THP1), a prostrate cell line (PC-3) and a colon cell line (caco-2, colo205, HCT-115), and specifically inhibiting PI3K-α or β isoform in the human cancer cell line.
 16. The method as claimed in claim 15, wherein dosage of compound of general formula 1 is in the range of 20 mg/kg to 100 mg/kg.
 17. The method as claimed in claim 15, wherein the representative compound A has a GI50 concentration in the range of 2.4 μM-2.6 μM when used for in vitro activity against colon and breast cancer cell lines.
 18. The method as claimed in claim 15, wherein the representative compound A demonstrates >74% optimal growth inhibition in human cancer cell lines at a concentration of 10 μM.
 19. The method as claimed in claim 15, wherein the representative compound E when used for in vitro activity against colon cancer cell lines increases sub-G1/G0 population and shows concentration dependent growth arrest in G1/G0 population and late apoptosis in colon cancer cell lines. 